In a 2005 interview with the game's producer Koji Igarashi published in the official Konami strategy guide, he chose the theme of "revenge" for this game, because the Belmonts had been seen as the good guys up to that point, and he thought it would be nice to try something other than a moralistic "good triumphs over evil" theme sometime. Another reason why was that Castlevania still had "an excellent world for telling a "dark hero" story", with Alucard being an example of this even though he's still considered somewhat good since he is fighting for the just cause of stopping Dracula. For Castlevania: Curse of Darkness however, he wanted the motivation itself to be impure, so he came up with the theme of revenge, and then he thought it could be a lot more interesting if each side was out for revenge against each other.
There exists an extremely early test prototype of Disney's Lilo & Stitch 2: Hänsterviel Havoc that is simply just a compilation of a platforming level from Ed, Edd n' Eddy: Jawbreakers and a racing level from Hot Wheels: World Race as a proof-of-concept that both styles of gameplay could fit in a single game pak. The only element of Lilo & Stitch that exists with in the game is Eddy's sprite in the Jawbreakers segment being replaced with Stitch.
Ed, Edd n Eddy: Scam of the Century uniquely uses flat character heads on 3D bodies. However, Ed's texture contains segments from a 3D head, suggesting that the game may have originally used fully 3D characters.
The Garib collectibles in Glover originated as an in-joke, according to designer Rich Albon:
"The studio was doing a port for a Japanese company at around the time of Glover and they got a faxed bug report (yes, a faxed bug report!) which had one item that read, There is a problem with the Garib.' No one knew what a Garib was - there was no reference to it in the in game or in the code. So it kind of became an office meme: anything without a name became a Garib."
Early footage of Dinosaur Planet shows that Sabre and Krystal were to utilize the Projectile spell by firing it directly from their hands. It seems this was already scrapped by the time of the December 2000 build that was leaked on the internet in early 2021, as Sabre (or Fox McCloud, who has already replaced Sabre at this point) and Krystal instead fire projectiles through their sword and staff respectively. This would carry over into Star Fox Adventures, where Fox can fire magic projectiles through Krystal's staff.
One holdover from this early idea that remains in both the December 2000 build of Dinosaur Planet and the final Star Fox Adventures is within the prologue, where Krystal, riding on top of a CloudRunner, is inexplicably shown to be able to fire blasts of magic from her own hands in the battle against General Scales' galleon.
Unused models of both Sabre and Krystal's arms can be found within the files of the leaked Dinosaur Planet ROM.
On July 17, 2023, Neopets was purchased from NetDragon through a management buyout deal by Dominic Law, the Neopets Chief Metaverse Officer and former Director of New Markets at both NetDragon and Cherrypicks. This lead to the formation of "World of Neopia, Inc.", a company comprised of team members from both Neopets and Neopets Metaverse, with Law serving as CEO. As part of this, it was announced that Neopets had received $4 million in investment money in early 2023, with additional funding from the management buyout equipping World of Neopia, Inc. to make "meaningful changes in pursuit of a Neopian renaissance." These changes include revamping the homepage and creating the 2024 mobile game "World of Neopets".
Despite the English version of Melee using Star Fox Adventures' voice cast in the game's Corneria and Venom stages, the Japanese version uses all of the original Star Fox 64 voice actors. Shinobu Satouchi, Hisao Egawa, Kyoko Tongu and Tomohisa Aso all reprise their roles as Fox, Falco, Slippy and Peppy respectively. The former two's voice clips are also used for Fox and Falco as fighters even abroad.
Frogger inspired the name of a transposon family in the fruit fly. Transposons are said to "jump" between and within genomes, which is likely why one of these genes was named after the game.
Flappy Bird was not originally a difficult game, but during development the pipes were moved closer together as the game was found to be boring when it was too easy.
At the start of the game's development, Black Tabby Games did not think that their previous game, Scarlet Hollow, was financially successful enough to support the studio on its own through a projected five-year development timeline, leading them to pursue a second game with fewer assets and a shorter development time. Tony Howard-Arias and Abby Howard, the only two members of the company, were inspired by a game jam entry named "Claim Your FREE BitBuddy™ Today!", which had impressed Howard-Arias for how much emotional storytelling was put into a small game. This lead to them discussing a concept for a horror story confined to a few locations with a single character on screen at a time.
A lot of imagery in Flicky is intended metaphorically, such as the bicycle and balloons on the opening titles representing the dreams of the chicks, and the space level representing the future that Flicky attempts to prevent the cat and lizard from taking away from the chicks. In addition, the choice to make Flicky a sparrow, but have the hatchlings she protects be chickens, was a representation of how non-parents can experience maternal instincts when seeing children in danger.
According to the British magazine Nintendo Magazine System, before settling on Yoshi's Island characters for Tetris Attack, Nintendo reportedly asked Rare to replace Panel de Pon's fairies with characters from the Killer Instinct series.
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In September 2021, Neopets attempted to enter the budding Non-fungible Token market with a project called the "Neopets Metaverse", predictably sparking major backlash from the Neopets fandom citing pre-existing criticisms and negative stigmas surrounding NFTs. However, much less predictable were the string of controversies that followed, which involved using the fansite Dress to Impress to make their NFTs (notably signified by one of the tokens having a glitch only present on Dress to Impress and not the official Neopets site), promotion of an R-rated NFT collection titled "Horny Hedgehogs", banning the word "gay" from their Discord server but permitting homophobic slurs, portraying those opposed to NFTs as the "Soyjak" meme, and in secret planning to get the main game developers to implement long-requested features so fans would "shut up" about the NFT project.
When the project first spread, the Neopets Twitter account stated in a direct message that it was a scam, putting doubt on its legitimacy, but the main brand would later would endorse the project. The most infamous endorsement came when the winner of an art contest ended up being an anti-NFT protest image, which they removed and - after being called out - subtly censored it by compressing it so hard that it couldn't be read without extremely close observance.
After two years, Neopets ultimately announced in July 2023 that it would be completely shuttering the Neopets Metaverse project after former CEO of the Metaverse division Dominic Law brokered a "management buyout deal", and that the game would no longer have any cryptocurrency or NFT elements.
The Japan-exclusive Super Famicom version of Monopoly was produced by famed Japanese copywriter and essayist Shigesato Itoi (best known to people outside of Japan as the creator of Nintendo's EarthBound series), who is a champion Monopoly player and the leader of the Japanese Monopoly association. Itoi also served as a supervisor on the game's Japan-exclusive sequel, The Monopoly Game 2.
The music track that currently plays in Dragon Rock in Star Fox Adventures was originally intended for the Walled City in Dinosaur Planet.
Dragon Rock originally just featured eerie sounding ambience for background music in Dinosaur Planet. In Star Fox Adventures, Walled City now shares the same stage music with LightFoot Village.
Masanao Arimoto, who took over Takaya Imamura's role as the character and sprite artist for Star Fox 2 from the first game, seemed to have cycled through a wide variety of new character pilots designs to represent the two Light class Arwing models, before finally settling on Fay (a spaniel) and Miyu (a Lynx). These beta designs were discovered in the Nintendo Gigaleak of 2020.
Some of these include a sheep, a bear, a deer, a hippo, and even Fara Phoenix (dubbed internally as "lady") from the 1993 Star Fox Nintendo Power comics. The sheep design would actually appear in an issue of Super Game Power magazine that had a feature on Star Fox 2 (before it was cancelled) along with Miyu, making it clear that it was an early design for what would become Fay.
What's also notable and curious is that there seem to be unused female human pilots found within the Gigaleak. It is speculated that Arimoto drew these up as generic templates to base the new female characters' designs off of, rather than introduce human characters into the Star Fox series specifically like what has been theorized since the Gigaleak. The fact that there are multiple different variants of the same non-descript woman with none of them being a different gender compared to the vastly more distinctive anthro designs that Arimoto brainstormed adds credence to this theory.
While Star Fox 64 would mark the debut of Star Wolf, the rival team of Star Fox, they were originally meant to debut in Star Fox 2, which was cancelled for twenty years before seeing an official release for the SNES Classic in 2017.
Something that's very peculiar in the final build of Star Fox 2, however, is how most of the mainstays of the Star Wolf team, such as Wolf O'Donnell, Pigma Dengar, and Leon Powalski, are present, all except for one: Andross' nephew, Andrew Oikonny. In his place is what appears to be a lemur character named "Algy", who is described by SF2's online manual as being rumoured to be "the most devious creature in the cosmos".
What makes this even more strange is the fact that Andrew actually was initially conceived for SF2, as a piece of concept art drawn by series' character designer Takaya Imamura portrays him along with Wolf, Leon and Pigma. In fact, there actually exists evidence that, by the time of Star Fox 2's gold build, Algy was still internally referred to as Andrew in the game's source code, which makes it all the more clear that Andrew was indeed planned to be in SF2 before being changed out for Algy.
It's worth pointing out, however, that despite being the main character designer for the first Star Fox, as well as future games like Star Fox 64, Imamura actually had very little to do with Star Fox 2's development, outside of the aforementioned initial Star Wolf concept art and also play-testing and advising towards the end, being only listed as under SF2's "Special Thanks" credits. Another staff member at Nintendo, named Masanao Arimoto, took over his duties as character/sprite designer for SF2. Comparing his final spritework to the original concept art, one could see that Arimoto took a lot of creative liberties with Imamura's initial designs, the latter of which look more closer to how the Star Wolf characters would look in Star Fox 64, with the most glaring example being Andrew transformed into an effectively different character.
It's pretty obvious that when Takaya Imamura returned for Star Fox 64 as its art director, Algy was reverted back into Andrew Oikonny.
Chris Hendricks, a former artist and composer for Club Penguin, was originally against the inclusion of the game's main villain Herbert P. Bear, as he felt that Club Penguin was a game that was meant to be "safe and fun" and thus didn't need a villain. However, during development of the PSA missions, it became apparent that it was becoming difficult to put obstacles in the player's way without some sort of villain behind it. The team member who first pitched the idea of adding a villain to the game initially came up with the idea of there being three polar bears: a boss bear, a skinny vegetarian henchman bear, and a big stupid bear who would lift heavy objects and be endearing and lovable. Some staff, however, felt that this was too many bears, and eventually reached a compromise: take all the best attributes of the three bears, combine them into one bear, and give him a lovable sidekick.
Chris, however, was still concerned about the idea of adding a villain, so to both build up mystery and try to appease him, the story was developed so that the villain wouldn't be revealed until the fifth mission: in the third mission, the only evidence of the villain was white fur. This gave them a potential escape route in case players didn't want a villain in the game, as they could have the fourth mission reveal that the whole thing was a misunderstanding and that a white puffle (which hadn't debuted at that point) was to blame. As it would turn out, fans loved the idea of a villain, so the fourth mission would give a shadowy teaser of the villain, before the full reveal of Herbert P. Bear in the fifth mission. Chris would later admit that he was wrong to not want a villain in the game, as Herbert became one of his favorite characters, and lead to the introduction of other memorable villains (i.e. Tusk and Ultimate Proto-Bot 10000) as well.
There exists an extremely early test prototype of Disney's Lilo & Stitch 2: Hänsterviel Havoc that is simply just a compilation of a platforming level from Ed, Edd n' Eddy: Jawbreakers and a racing level from Hot Wheels: World Race as a proof-of-concept that both styles of gameplay could fit in a single game pak. The only element of Lilo & Stitch that exists with in the game is Eddy's sprite in the Jawbreakers segment being replaced with Stitch.
Ed, Edd n Eddy: Scam of the Century uniquely uses flat character heads on 3D bodies. However, Ed's texture contains segments from a 3D head, suggesting that the game may have originally used fully 3D characters.
Early footage of Dinosaur Planet shows that Sabre and Krystal were to utilize the Projectile spell by firing it directly from their hands. It seems this was already scrapped by the time of the December 2000 build that was leaked on the internet in early 2021, as Sabre (or Fox McCloud, who has already replaced Sabre at this point) and Krystal instead fire projectiles through their sword and staff respectively. This would carry over into Star Fox Adventures, where Fox can fire magic projectiles through Krystal's staff. 
Despite the English version of Melee using Star Fox Adventures' voice cast in the game's Corneria and Venom stages, the Japanese version uses all of the original Star Fox 64 voice actors. Shinobu Satouchi, Hisao Egawa, Kyoko Tongu and Tomohisa Aso all reprise their roles as Fox, Falco, Slippy and Peppy respectively. The former two's voice clips are also used for Fox and Falco as fighters even abroad.
The music track that currently plays in Dragon Rock in Star Fox Adventures was originally intended for the Walled City in Dinosaur Planet. 
Masanao Arimoto, who took over Takaya Imamura's role as the character and sprite artist for Star Fox 2 from the first game, seemed to have cycled through a wide variety of new character pilots designs to represent the two Light class Arwing models, before finally settling on Fay (a spaniel) and Miyu (a Lynx). These beta designs were discovered in the Nintendo Gigaleak of 2020.
While Star Fox 64 would mark the debut of Star Wolf, the rival team of Star Fox, they were originally meant to debut in Star Fox 2, which was cancelled for twenty years before seeing an official release for the SNES Classic in 2017.