
This game originally started out as a racing game for the Wallace & Gromit series, called "Wallace & Gromit: The Grand Tour". Unused graphics and codes relating to Wallace & Gromit can still be found within the game's data, such as codes describing the main characters' appearance, as well as pictures of Wallace, Gromit, Preston & Wendolene.
A hidden programmer message is hidden in the files of Disk 3, stating:
"great special thanx to you, ARIKO...from your husband, HIDEJI".
"great special thanx to you, ARIKO...from your husband, HIDEJI".

Through the use of Action Replay codes, it's possible to die on the Level Select map. When this happens, Pac-Man will respawn on the game's title screen; moving around will reveal a stool and fishing rod off-screen, suggesting that he was originally planned to fish on the title screen instead of just standing and playing idle animations.
The Pokémon Toedscool and Toedscruel (divergent evolutions of Tentacool and Tentacruel) are called "OKAKINGU" and "OKAGYARADOSU" in the game's data respectively. This is interesting as these names seem to instead reference the names of Magikarp, called "Koiking" in Japan, and its evolution Gyarados respectively, meaning that the games were originally going to feature a pair of divergent evolutions for the Gyarados family instead of the Tentacruel family. However, there is no other data in the games but names for these scrapped Pokémon.

Before the save point in the Forgotten Region of the Human World, there are multiple locked cells which can be opened with the Brass Key. Near the save point is an empty cell that appears to have nothing of note inside. However, if the player positions the camera correctly a hanging corpse can be seen hanging out of bounds through the wall. In a Japanese trailer for the game, a similar location can be seen with a corpse hanging inside a cell which gets unlocked so it's likely that the corpse was moved out of bounds in the final version to avoid players seeing this scenery.

In 2021, the game's debug menu was discovered on a demo disc and was later executed in the retail version through the creation of a GameShark code. The menu contains four options featuring the surnames of four of the game's programmers (most likely to test out certain aspects of the game each one focused on more easily): Satoshi Kishiwada, Yasuhiro Yamamoto, Tamotsu Goto, and Naoto Uenaka.
Additionally, by selecting "Area 7 Action" and "Scene 06 - Last-Scene", you can access a beta version of the crumbling Soda Fountain, the final area of the game Spoiler:where Musashi battles against Dark Lumina, lacking textures and featuring an overhead camera compared to the sidescrolling camera in the final game.
Additionally, by selecting "Area 7 Action" and "Scene 06 - Last-Scene", you can access a beta version of the crumbling Soda Fountain, the final area of the game Spoiler:where Musashi battles against Dark Lumina, lacking textures and featuring an overhead camera compared to the sidescrolling camera in the final game.

Contrary to the official explanation about Kirby's lack of a Keyblade after inhaling Sora, there is an unused Keyblade model for Kirby, meaning that at some point in the development of the final DLC Fighter, Kirby would have indeed wielded Sora's Kingdom Key during the use of Sora's Neutral Special, but this idea was scrapped. The weapon can be found in the game's data but remains functionally unfinished, and even when the game is modded the Keyblade will not spawn in.
In numerous official video game demo compilation discs (such as the fondly regarded Pizza Hut demo disk that came about as a promotional stunt co-jointed by Sony Computer Entertainment America and Pizza Hut), there was a "late demo" of Crash Bandicoot 3: Warped included, featuring a playable beta version of the level "Under Pressure".
As this version of the stage came from an earlier build of the game, there are distinguished differences between this version and the final version. Two differences that stand out between versions is that the signature pufferfish is purple instead of its usual orange, and that the Time Trial record times differ in such a manner that the demo version appeared to be deemed too difficult shortly before the final build's completion and retail release.
In the demo:
•Sapphire Relic Time: 1:28:33
•Gold Relic Time: 1:04:93
•Platinum Relic Time: 0:58:73
In the final release version:
•Sapphire Relic Time: 1:46:00
•Gold Relic Time: 1:17:90
•Platinum Relic Time: 1:10:50
As this version of the stage came from an earlier build of the game, there are distinguished differences between this version and the final version. Two differences that stand out between versions is that the signature pufferfish is purple instead of its usual orange, and that the Time Trial record times differ in such a manner that the demo version appeared to be deemed too difficult shortly before the final build's completion and retail release.
In the demo:
•Sapphire Relic Time: 1:28:33
•Gold Relic Time: 1:04:93
•Platinum Relic Time: 0:58:73
In the final release version:
•Sapphire Relic Time: 1:46:00
•Gold Relic Time: 1:17:90
•Platinum Relic Time: 1:10:50
The fifth and sixth stages are different between the Arcade and console versions.
In the arcade version the fifth stage is a high-rise building where you fight a militia working for the main villain, and when you reach the rooftop you fight the fifth boss of the game. The sixth and final stage is made of a boss rush where you fight all the previous gangs while chasing a big crime boss in the harbor. After defeating all the gangs, Spoiler:the crime boss gets killed and the final battle against Martha Splatterhead ensues.
In the console version the boss rush takes place in the fifth stage instead, right before facing the militia. The sixth and final stage is simply the final boss battle set atop the rooftop of the high-rise building, with the harbor stage being completely removed. Additionally Spoiler:the crime boss from the arcade version is missing in the SNES port, which establishes Martha Splatterhead as the leader of the gangs early on.
In the arcade version the fifth stage is a high-rise building where you fight a militia working for the main villain, and when you reach the rooftop you fight the fifth boss of the game. The sixth and final stage is made of a boss rush where you fight all the previous gangs while chasing a big crime boss in the harbor. After defeating all the gangs, Spoiler:the crime boss gets killed and the final battle against Martha Splatterhead ensues.
In the console version the boss rush takes place in the fifth stage instead, right before facing the militia. The sixth and final stage is simply the final boss battle set atop the rooftop of the high-rise building, with the harbor stage being completely removed. Additionally Spoiler:the crime boss from the arcade version is missing in the SNES port, which establishes Martha Splatterhead as the leader of the gangs early on.

In an early unused version of the "Mountain of Rubble" cutscene, Fiona is voiced by a different voice actress, but she is completely silent in the final version. In addition, there's a unique music in the cutscene that was removed in the final version, and the dirt effects when Fiona falls back down were originally brown instead of grey.
The opening scene in the interrogation room was originally supposed to be darker. In the released version, the police detectives only gave Joker a couple of shots of a sleeping drug and beat him up. An unused cutscene found in Persona 5 Royal shows a tray of some kind which implies that the police detectives brutally tortured him.

If the player installs external NES ROMs onto the Controller Pak and selects the "Save a Letter" option at the Post Office, the game will bring up a unique menu for viewing and deleting the ROMs. Because Nintendo never officially implemented a means of installing NES ROMs onto the Controller Pak, this menu goes unused in normal gameplay. The menu is also absent from Animal Crossing and Dobutsu no Mori e+, due to the player being able to delete the ROMs directly from the GameCube's main menu.
Additionally, in the iQue version, the menu's text is corrupted, with the title appearing as garbled characters and the rest of the menu being in Japanese.
Additionally, in the iQue version, the menu's text is corrupted, with the title appearing as garbled characters and the rest of the menu being in Japanese.

In addition to the multitude of NES games obtainable as furniture items, the player can also acquire a blank NES. On the surface, it appears to be nonfunctional, and interacting with it simply brings up the text "I want to play my NES, but I don't have any software." However, in 2018, dataminers discovered that using the item actually causes the game to scan the GameCube's memory cards for externally installed NES ROM data. By downloading NES ROMs onto the memory card, it's possible to play them in Animal Crossing via the blank NES, including titles not obtainable in the base game. This indicates that at one point in development, Nintendo planned to distribute additional NES games via memory cards.
The ROM loading function additionally enables one to patch NES ROMs after they are loaded, which can be used to install mods for Animal Crossing itself via the memory card.
The ROM loading function additionally enables one to patch NES ROMs after they are loaded, which can be used to install mods for Animal Crossing itself via the memory card.

Within the data of the PlayStation version of this game is an unused track which was supposed to be a bonus race track which was dropped because of time constraints. This track is in a very unfinished state with no texturing present.
NSFW - This trivia is considered "Not Safe for Work" - Click to Reveal
In Episode 205 of "The Angry Video Game Nerd" in which the Nerd reviewed Doom, game designer Sandy Petersen claimed that the lack of music on the Atari Jaguar version was due to a monetary issue regarding the game's composer, stating in the composer's contract that he was supposed to be compensated the same amount of money for the Jaguar version as he was for the PC version, despite the Jaguar version selling less copies. Sandy Petersen ended by saying:
However, designer John Romero disputed this claim on Twitter shortly after the episode's release, claiming the lack of music was due to a lack of memory and CPU space available on the Jaguar cartridge.
"I know that's a shitty reason to leave out the music, but there ya have it."
However, designer John Romero disputed this claim on Twitter shortly after the episode's release, claiming the lack of music was due to a lack of memory and CPU space available on the Jaguar cartridge.
NSFW - This trivia is considered "Not Safe for Work" - Click to Reveal
On April 23rd, 2015, an update was released that altered some frames of animation for Filia, Fukua, and Cerebella. This was done with the purpose of removing or heavily obscuring some panty shots, as the developers considered them to be unnecesary fanservice.
Additionally, two unused animations for Filia were also removed from the Digital Art Compendium. These animations include a time over animation where Samson tears apart the top of her shirt while she tries to cover herself up, and a taunt where Samson spanks Filia hard enough to make her fly a short distance and land on her knees.
Additionally, two unused animations for Filia were also removed from the Digital Art Compendium. These animations include a time over animation where Samson tears apart the top of her shirt while she tries to cover herself up, and a taunt where Samson spanks Filia hard enough to make her fly a short distance and land on her knees.
There were originally plans to increase the amount of potion and item slots, but the developers weren't sure how to implement it and had concerns over the game breaking if the player stacked the same potion into 10 slots instead of 5.
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