According to Steven Universe creator Rebecca Sugar, the inspiration for the show's background color palettes comes from the level aesthetics in Super Mario World 2: Yoshi's Island, due to its colorful atmosphere and also being one of her favorite video games at the time.
Valentine's design was officially changed on May 13th, 2014 via a patch update. The update changed all parts of her design that involve a red cross against a white background to be altered so the cross is colored pink instead. This was done in order to prevent legal action by the International Committee of the Red Cross.

The game's smoke texture, labelled "gas_b5" in the source code, was intended to be much more detailed in appearance, but ended up corrupted in the final game due to being encoded in the RGBA16 format rather than the intended IA16. While the glitched texture would theoretically look like a swarm of multicolored pixels as a result of this error, it instead appears as a clump of black pixels due to the game displaying it without any colors, resulting in it not looking out of place. Modifying the game's code to convert the texture to the IA16 format results in it properly displaying.
Within the game's files is the main title theme to the Star Wars series, presumably having been used to test how the Sony ADPCM audio compression would affect the game's music.
The song that plays during the game's final boss, Spoiler:the Titan Dweevil, has 11 alternating sections and musical cues, more than any other boss in the Pikmin series. The conditions that trigger each theme are based off Spoiler:the treasures it wields, from the number of treasures present to the particular one in use. The boss also has its own unique attack preparation cue, defense cue, and "defeated" cue.

When playing the game's tutorial "A Keeper's Training" on Expert mode, a secret room can be found after you finish the sword fight with the Sparring Partner. You must quickly run to the table behind the sparring arena and pick up the key, and then follow the Sparring Partner into the hallway he walked out of. This must be done quickly as a set of bars will lower to prevent entry not long after the Sparring Partner re-enters the hallway. Once in the hallway, continue past him to the right until you see a locked door. You can then either use the key to unlock it or bash the door open with the sword. Inside this room is a pair of crudely-modeled basketball hoops, complete with a basketball that can be equipped and thrown, and in the very back of the room, a Bedroll can be found containing a set of humorous quotes attributed to the developers during the making of the game.

In a November 2020 Medium article, Maddy Thorson, who served as the game's writer and director, confirmed longstanding rumors that Madeline, the protagonist of Celeste, is a transgender woman. Thorson described the game's story as allegorical for her own process of coming to terms with her gender identity, and stated that while the idea didn't initially come to her during development, she "began to form a hunch" while working on the DLC chapter "Farewell", becoming certain of Madeline's transgender status after the chapter's release. Thorson came out as transgender herself in the same article.
Thorson additionally stated that although the possibility of Madeline being trans was discussed with the rest of the development team when making "Farewell", they ultimately decided not to include any overt statements past visual allusions in the chapter's ending, stating that it would be more in-character for Madeline to keep such information private. At the same time, however, Thorson stated that had she started development of Celeste already knowing that she was trans, she would've depicted Madeline differently.
Thorson additionally stated that although the possibility of Madeline being trans was discussed with the rest of the development team when making "Farewell", they ultimately decided not to include any overt statements past visual allusions in the chapter's ending, stating that it would be more in-character for Madeline to keep such information private. At the same time, however, Thorson stated that had she started development of Celeste already knowing that she was trans, she would've depicted Madeline differently.

NSFW - This trivia is considered "Not Safe for Work" - Click to Reveal
On April 22, 2015, Nintendo of America uploaded a tweet with an image of a Waluigi plush doll riding a Wiggler plush doll, with the caption:
Someone at Nintendo of America forgot to spell-check Wiggler's name, because the term "wigger" describes a white person who emulates the behaviors of African-Americans.
Shortly after finding the mistake, Nintendo of America took it down and apologized for the error.
"Reply "WAAAA" for #WaluigiWednesday. Reply "🌼" for #WiggerWednesday."
Someone at Nintendo of America forgot to spell-check Wiggler's name, because the term "wigger" describes a white person who emulates the behaviors of African-Americans.
Shortly after finding the mistake, Nintendo of America took it down and apologized for the error.
The United States Environmental Protection Agency (EPA) had used music from Yoshi's Island DS for their Flash game "Recycle City Challenge." After it had been discovered in 2019, the EPA denied claims that they had stolen music from Nintendo claiming it had been made by a contractor, and that "we are looking into whether the contractor received permission to use the music, to the extent permission was necessary in this instance." Since then, the song has been removed from the game's soundtrack.
According to environment artist Ted Anderson in an interview with YouTuber KIMI TALKZ, Retro Studios was apparently hesitant on working with Nintendo to create the game:
“Initially I think we were supposed to help them finish stuff out and help them get over the finish line. It ended up being where we ended up making more than that; we ended up making entire tracks from scratch. It was kind of funny, because I remember initially that a good deal of the team was kind of not super-duper excited about that, but I was stoked, I was thinking "this is gonna be awesome". Everybody else was kinda like "ok, I guess we're gonna do this", and I'm like "what are you talking about, we're gonna make a Mario Kart game for the 3DS - wow!"
Despite the game portraying heavy usage of violence, blood, and sexual content, the game is still considered to be family-friendly based on the Commodore CDTV version's box cover.
The Koopa Troopa shell bouncing between the pipes of the Wii Koopa Cape’s starting gate is a reference to a Koopa Troopa’s behavior when Mario/Luigi steps on them a second time.
In the 34th entry of the Anime News Network series Jason Thompson's House of 1000 Manga, Jason Thompson stated that Capcom USA was disatisfied with how Jojo's Venture was doing in arcades at the time, to the point that he was told by a Capcom USA employee that they wouldn't release the game on home consoles "unless CAPCOM Japan forced them to".
As of Version 1.04.01, there is a glitch in which Malenia will regain health while attacking a player character that is in their long death animation. This in turn can make the fight more difficult in multiplayer if her aggro does not change from a killed player until their health bar is completely off screen.
According to composer Grant Kirkhope, the DK Rap was written as a joke song that ended up being interpreted by audiences as a serious attempt at writing hip-hop. Consequently, he expressed confusion at the tongue-in-cheek cult following the song picked up decades later, noting that "bizarrely, this became its own thing now."
In June 2013 interview with game's designer Toshinobu Kondo published in the Action Gameside magazine, he was asked what meaning there was in the game's title "Sayonara"? He responded:
"That title is a holdover from when we were thinking this would be a final fan service item for the Umihara Kawase series. It had a nice sense of impact so we kept it even as the concept of the game changed. The title conveys a sense of being ready for the end, along with the wish to return."
In a 1997 interview with game's planner/designer Yoshiro Kimura published in the "Moon: Official Book", he stated that the team used pictures of the Love-de-Lic staff's cars and homes for the game's ending staff roll.
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