On September 25, 2010, Level-5 employee Jiro Ishii accidentally ousted the game's existence via a tweet to Square Enix employee Jin Fujisawa that stated in Japanese:
"Huh? Oh, Gyakuten XX. I'm making it, with Mr. Takumi!"
This started rumors of a new Ace Attorney game being developed by Level-5, due to the trend of newer Capcom games from established franchises being developed externally (i.e. DmC: Devil May Cry being developed by Ninja Theory). Ishii quickly covered up the mistake later that day, tweeting out:
"A misunderstanding seems to be spreading, so let me say that I'm currently working only on Time Travelers."
When traveling on the cable car, there is a 1 in 64 chance for an NPC to appear in the background - a hiker, a camper, or a picnicker. However, there also exists a 4th NPC which never appears due to a faulty line of code. These include a Zigzagoon in Emerald, and a Poochyena in Ruby and Sapphire
The infamous American Mega Man 2 box art, where Mega Man wields a pistol instead of his signature Mega Buster, was not an attempt to make Mega Man appear more "edgy", but was actually born from a misconception where Capcom's art director believed Mega Man was using a gun too small to be seen in sprite form rather than transforming his arm. Artist Marc Ericksen would say to Nintendo Age in 2012:
"So we're talking about the infamous Mega Man 2 where Mega Man is actually running around waving a pistol! Okay so, the question on everyone's mind is 'how could the illustrator be such a complete idiot that he didn't realize that Mega Man had a cannon for an arm, and why is he holding a pistol for God's sake.'
What happened was I had to go down to Capcom and do a game they just got in from Japan. They had a beta version; they were in a hurry to get this thing out. So I went down there. The gentlemen was the art director was there with the beta guy and they were waiting for me and I came with my pad and they started running the game. What we saw was this little pixelated figure of the famous Mega Man running around on the screen shooting. Bang, bang, bang, he's shooting obviously like this with his arm [Marc points his arm forward]. So I said to the art director, 'what is he shooting? What is he shooting with?' The art director said, 'he must have a pistol because I don't see that he's got a rifle so he must have a pistol.'
'So... a pistol? You want me to do a pistol?' And he said, 'yeah, let's put a pistol in there.' So I did what I was told and I put the pistol in there. Add to the fact that they only had, like, a day and a half for me to do the painting and what you wound up with was not the greatest result but certainly a result that was not my fault. It was one of those things. Here's my opportunity: I'm saying to everybody now that was not my fault! Talk to Capcom about the pistol."
Sonic's graphic on the title screen of Sonic the Hedgehog has a belly that is obscured by the logo's ribbon. This is a leftover of the animatic of Sonic's appearance on the title screen. On earlier, less accurate emulators, including Sega's own emulator made for Sega Smash Pack Volume 1 on Dreamcast, a common error would involve Sonic's belly hanging over the ribbon.
The file header (the game's name used as an introduction for its code) for Sonic the Hedgehog is supposed to have a line break in the middle, so it reads as:
SONIC THE HEDGEHOG
However, this line break was done through spaces instead of an actual line break, so if one plays Sonic the Hedgehog on an emulator that shows the file header name (such as Kega Fusion), it will instead read:
SONIC THE...............HEDGEHOG
[Note: periods added due to VGFacts automatically removing multiple rows of spaces.]
The US versions of Gyromite and Stack-Up did not have their title screens localized, so they retain the games' Japanese titles of Robot Gyro and Robot Block respectively.
US Stack-Up in action. Note that the ROB being used here is somewhat yellowed from sun exposure, so some may mistake him for a yellow JP Robot - observe the sticker on his base and you will see that he is NTSC: https://www.youtube.com/watch?v=Da0_OgCCLJA
In 2005, IGN released an April Fools' Day article suggesting that Gyromite would be getting a release for Game Boy Advance in the Classic NES Series line of games, presenting it as having been leaked by a pennysaver newspaper with an image of the supposed "mini-ROB" that would be included. The article could be rather convincing to someone unfamiliar with ROB up until the final sentence, which contains a joke comment from a Nintendo representative forgetting about the existence of Stack-Up.
However, if one is intimately familiar with ROB and the Classic NES Series, there are a few red flags that could expose the article's joke nature even if one weren't to check the publication date, particularly that the miniature ROB isn't facing towards the screen of the GBA, while the original NES ROB used a light sensor in its eyes pointed at the screen; the box art has the "Robot Series" logo at the bottom, despite no other Classic NES Series releases of black box titles keeping the series logos; ROB using Stack-Up blocks instead of Gyromite gyros; and the box art provided not being a different shape from an average GBA game to account for the bundled ROB.
The article also had a link to a colour version of the box art included, but that has since been taken offline and is most likely lost.
In the launch version of Nickelodeon All-Star Brawl 2, GIR's voice lines were not artificially pitched up as they were in the Invader Zim series, making it sound as if they had got a very poor replacement actor to those not familiar with how GIR's voice was originally made. GIR's voice actor Rosearik Rikki Simons pointed this out on Twitter, and it would be resolved in a latter update. However, the updated GIR voice lines still don't have the digitizer voice filter he had in the original series.
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Inverse Ninjas vs. The Public Domain marks one of the first uses of Mickey Mouse in a non-parody-protected legitimate commercial product for a North American market without Disney endorsement, with Mickey's update being planned to come out to the hour of his entrance into the public domain, but releasing early by mistake. The social media account for the game noted that, although the game's concept is quite silly and lighthearted, utilizing the juxtaposition of characters who would typically not be armed wielding guns, and in spite of the long history of counterculture artists highlighting Mickey Mouse for mockery because of the saccharine image he would develop and how it juxtaposes against Disney's cutthroat corporate activities, it was intended as a sincere tribute to the characters featured, rather than a satire or parody, also noting that Mickey Mouse had been depicted wielding guns in earlier Disney cartoons:
"We're not the Winnie The Pooh: Blood And Honey guys, we actually like Mickey Mouse.
This isn't a parody, it's a love letter, and the mouse deserves his damn gun back."
Donkey Kong's sprite on 75M in Super Smash Bros. Brawl and Super Smash Bros. for Wii U has a tan skin tone, which is different from DK's paler sprite in either the NES or arcade versions of Donkey Kong. This appears to be the result of Nintendo using an image of the game's arcade version originating from a Japanese retro gaming fan site called Muu-World as reference material, as that image seems to have a color error that makes DK appear tan. The English-language fan wiki Super Mario Wiki has been hosting a different Donkey Kong screenshot with the same error on its page for the game since 2005, and the source of the error as well as several of the images featuring it (including the Mario Wiki screenshot) is currently unknown. It also gives DK a coincidental resemblance to the appearance on the box art for NES Donkey Kong and in-game in Atarisoft's Commodore 64 Donkey Kong. This was fixed for Super Smash Bros. Ultimate.
In the level "Paths of the Dead", there is a voice line error after the game transitions from a cutscene into the game. Legolas says "The way is shut. It was made by those who are dead, and the dead keep it." One second later, he repeats the very first line again, but quieter and with less emphasis, "The way is shut." This line appears in the cutscene's subtitles, suggesting that it was not properly edited out because it was mistakenly not recognized as an outtake in the first place.
Many Star Fox 64 players have referred to the Venom army general piloting the mecha boss encountered in the Easy Route Corneria path as "Granga", presumably because of the Star Fox 64 Nintendo Power Official Strategy Guide referring to him as such.
In reality, or at least going by the official Japanese Star Fox 64 guidebook and also Star Fox 64 3D, the name "Granga" actually refers to the aforementioned mecha itself. Like most of Andross' lieutenants (with the exception of Caiman), the pilot himself seemingly never had a proper name.
At one point, the official Spotify, Apple Music, and YouTube releases of the song "Bone Yard" from Crash Bandicoot N. Sane Trilogy opened with a GEICO insurance commercial as part of the song. This seemed to have not been part of its initial upload in 2017, and has since been fixed.
One of the few tracks included from Donkey Kong Country: Tropical Freeze within the soundtrack for both Super Smash Bros. for Wii U and Super Smash Bros. Ultimate is "Swinger Flinger". However, actually listening to the track reveals it to instead be the theme for the Bopopolis stage.
This error is not presented in the Japanese versions of these games, where the "Swinger Flinger" track is properly referred to by its Japanese name equivalent to Bopopolis, ふみふみラビリンス (Fumifumi Rabirinsu), or Stomping Labyrinth. In comparison, the actual Swinger Flinger track and stage in the Japanese version of Tropical Freeze is called バインラビリンス (Bain Rabirinsu), or Vine Labyrinth.
One of the "Ice Age" (aka Pleistocene) era prehistoric creatures introduced in Zoo Tycoon: Dinosaur Digs is the "Giant Tortoise". In real life, as mentioned in its in-game description, its name is Meiolania.
Strangely enough, Dinosaur Digs depicts the Giant Tortoise as a tundra-dwelling reptile, perhaps to give it parity with its fellow Pleistocene/"Ice Age" animals such as the Woolly Mammoth, Sabre-Tooth Tiger (aka Smilodon) and Woolly Rhino, that all share the Tundra biome. In real life, the Meiolania actually lived in warmer, sub-tropical habitats such as prehistoric Australia.
One of the dinosaurs introduced in Zoo Tycoon's first expansion pack, Dinosaur Digs, is the Caudipteryx, a small bird-like dinosaur from Asia. In-game, it is listed as hailing from the Jurassic era, and it's even one of the dinosaurs the player is required to adopt in the "Jurassic Zoo" scenario, which hence its title, requires utilizing all of the game's Jurassic era dinosaurs to win. This is an error on Blue Fang's part, as the Caudipteryx actually hailed from the early Cretaceous period.
When traveling on the cable car, there is a 1 in 64 chance for an NPC to appear in the background - a hiker, a camper, or a picnicker. However, there also exists a 4th NPC which never appears due to a faulty line of code. These include a Zigzagoon in Emerald, and a Poochyena in Ruby and Sapphire
Sonic's graphic on the title screen of Sonic the Hedgehog has a belly that is obscured by the logo's ribbon. This is a leftover of the animatic of Sonic's appearance on the title screen. On earlier, less accurate emulators, including Sega's own emulator made for Sega Smash Pack Volume 1 on Dreamcast, a common error would involve Sonic's belly hanging over the ribbon.
The Course Information text for Fire Field is misspelled as "Cource Information" in the Japanese version.
In the English version, the Super Galick Gun is erroneously referred to as the "Super Garlic Gun". This was fixed in the game's sequel.
The US versions of Gyromite and Stack-Up did not have their title screens localized, so they retain the games' Japanese titles of Robot Gyro and Robot Block respectively.
In 2005, IGN released an April Fools' Day article suggesting that Gyromite would be getting a release for Game Boy Advance in the Classic NES Series line of games, presenting it as having been leaked by a pennysaver newspaper with an image of the supposed "mini-ROB" that would be included. The article could be rather convincing to someone unfamiliar with ROB up until the final sentence, which contains a joke comment from a Nintendo representative forgetting about the existence of Stack-Up. 
In the launch version of Nickelodeon All-Star Brawl 2, GIR's voice lines were not artificially pitched up as they were in the Invader Zim series, making it sound as if they had got a very poor replacement actor to those not familiar with how GIR's voice was originally made. GIR's voice actor Rosearik Rikki Simons pointed this out on Twitter, and it would be resolved in a latter update. However, the updated GIR voice lines still don't have the digitizer voice filter he had in the original series.
Donkey Kong's sprite on 75M in Super Smash Bros. Brawl and Super Smash Bros. for Wii U has a tan skin tone, which is different from DK's paler sprite in either the NES or arcade versions of Donkey Kong. This appears to be the result of Nintendo using an image of the game's arcade version originating from a Japanese retro gaming fan site called Muu-World as reference material, as that image seems to have a color error that makes DK appear tan. The English-language fan wiki Super Mario Wiki has been hosting a different Donkey Kong screenshot with the same error on its page for the game since 2005, and the source of the error as well as several of the images featuring it (including the Mario Wiki screenshot) is currently unknown. It also gives DK a coincidental resemblance to the appearance on the box art for NES Donkey Kong and in-game in Atarisoft's Commodore 64 Donkey Kong. This was fixed for Super Smash Bros. Ultimate.
Many Star Fox 64 players have referred to the Venom army general piloting the mecha boss encountered in the Easy Route Corneria path as "Granga", presumably because of the Star Fox 64 Nintendo Power Official Strategy Guide referring to him as such.
One of the "Ice Age" (aka Pleistocene) era prehistoric creatures introduced in Zoo Tycoon: Dinosaur Digs is the "Giant Tortoise". In real life, as mentioned in its in-game description, its name is Meiolania. 
One of the dinosaurs introduced in Zoo Tycoon's first expansion pack, Dinosaur Digs, is the Caudipteryx, a small bird-like dinosaur from Asia. In-game, it is listed as hailing from the Jurassic era, and it's even one of the dinosaurs the player is required to adopt in the "Jurassic Zoo" scenario, which hence its title, requires utilizing all of the game's Jurassic era dinosaurs to win. This is an error on Blue Fang's part, as the Caudipteryx actually hailed from the early Cretaceous period.