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Animal Crossing Part 2 - Did You Know Gaming? Feat. JonTron
Animal Crossing - Did You Know Gaming? Feat. SpaceHamster
 
In an early announcement trailer for the Nintendo Gamecube, Animal Crossing was called (or at least promoted as) "Animal Forest for Nintendo Gamecube", outright referencing the original Japanese title of the game (Dōbutsu no Mori or "Animal Forest" in English). This suggests that either the English localizers were thinking of keeping the game's original title, albeit translated, or the title "Animal Crossing" was not yet finalized.
Contributed by PirateGoofy
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On August 7, 2002, Nintendo held a contest called the Animal Crossing Official Pioneers Program, where a limited number of participants would be able to receive an early-access copy of Animal Crossing. To apply for selection, one would have to submit a short response of 50 words at most explaining why Nintendo should pick them to be "Animal Crossing Pioneers", with 125 teams of two people (totaling to 250 applicants) ultimately being chosen. Each winner was provided with a specially-marked promotional disc for Animal Crossing, a 59-block memory card, and a calendar spanning September 2002 to December 2003; in addition, winners were given access to an online forum where they could interact with Nintendo of America staff members, completing in-game objectives, providing feedback, and participating in online chats.
Contributed by game4brains
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When the player meets Mr. Resetti for the sixth time, one of his lines reads "You got another think comin'!!!" This line contains a typo by mistakenly saying "think" rather than "thing."
Contributed by game4brains
Animal Crossing for the GameCube is a direct port of the Japanese-only Nintendo 64 Dōbutsu no Mori (Animal Forest) so it takes up very little space on the GameCube disc. The entire game is loaded into the GameCube's RAM, and as a result, after the player enters their town they can remove the game disc from the GameCube and continue to play the game normally.
Contributed by KidDivinegon
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Sometimes villagers will request the player to track down their "Pokémon Pikachu". This refers to the virtual pet toy of the same name, rather than the creature itself.
Contributed by RadSpyro
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A mole named Mr. Resetti will pop up to scold the player if they reset the game without saving. On the sixth and random subsequent times, he will force the player to copy what he says by typing it in, and will not leave until they do so correctly. However, typing in the following phrases will trigger special dialogue where Mr. Resetti scolds the player even more:

"no", "NO!", "jerk", "Die!", "Loser", "RESET", "freak", "Creep", "no way", "Leave!" "No Way!", "shut up", "go away", "Pinhead", "Dirtbag", "Scumbag", "Shut Up!", Go Away!", "Butthead", "Bite me!", "U R UGLY", "groundhog", "You stink", "I + Reset", "You suck!", "I hate you", "Moles suck", "Who Cares?".
Contributed by Boyobmas
Mr. Resetti was added into the game when developers noticed that, during play testing of Animal Crossing, many players were resetting their consoles to let the stock in Tom Nook's store change. They felt that this was toying too much with the game's mechanics and added Mr. Resetti in to discourage this behavior.
Contributed by CosmykTheDolfyn
In the Japanese versions, Jane has brown skin, white fur, tired eyes, and large, pink lips. This design was heavily altered during localization to avoid any possible racial tension.
Contributed by game4brains
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If the player goes to another town and resets the game before going back to their town, the next time they load up their profile they will start with a Gyroid face.
Contributed by gamemaster1991
There are numerous unused items in the game's code, all of which can be accessed with cheats. These include:
• A blue fish, possibly used to test the fishing function.
• DUMMY, a glitch item appearing as a white triangle with Japanese text on it reading "ダミー", which translates to "DUMMY", hence the name. Once in an Igloo, you obtain the item in a similar way to other furniture. The animal might want to play a game where he or she will ask you to pick two cards. One card you have to buy something and one card you will get a free prize. The prize card may sometimes be a DUMMY card.
• A glowing yellow box that moves back and forth, can push the player around (sometimes making them float), and can modify the spread of Paper Airplanes.
• A tool labeled "Sickle", which makes the player function as if they had nothing in their hands. Strangely, it appears as a toolbox when dropped, a feature that only appeared in Wild World and New Leaf.
• An "Unknown Item" that appears in the player's inventory as a box with a question mark, and appears in homes as a clone of the DUMMY item.
• Paper Airplanes, which, if you place on the ground, walk off screen, and come back, will duplicate itself. Pressing the A button while on top of the paper airplane will make it disappear visibly, but will still exist in the system's memory. Letting the airplane multiply too much can crash the game.
Contributed by game4brains
The game has an entire debug mode which can be activated by setting the disc ID version field to 0x99 through using a hex editor and change byte #7 (0x00000007) of the ISO/GCM file. It works on all versions of the game.
Contributed by WhiteSamurott
The "forest map select" from Doubutsu no Mori still exists in the game's code, but there's no easy way to access it.
Contributed by WhiteSamurott
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The train conductor 'Porter' is based off of the Japanese song 'The Monkey Palanquin Carrier'. This is the reason he's a monkey.
Contributed by wiz85
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An unused villager, fan-dubbed Blazel, can be found in the game's code. The villager's name is a series of glitched characters, and has characteristics similar to Bliss and Hazel. Talking to the villager a second time changes its name to Jambette, possibly due to memory errors. An odd quirk is that it's loaded in the memory with other non-villager NPCS.
Contributed by Bean101
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Animal Crossing is only one of four versions of the same game. Three of which were only released in Japan. The first version was for the Nintendo 64, entitled "Dobutsu no Mori", which translates to "Animal Forest". The second version, "Dobutsu no Mori +", was an enhanced remake of the original game, released on the Gamecube. This was the version that would be localized as Animal Crossing in the United States. The final version, "Dobutsu no Mori e+", was a second enhanced remake released on the Gamecube. There was also an unreleased sequel to "Animal Crossing", tentatively entitled "Animal Crossing 2".
Contributed by game4brains
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The NES games Balloon Fight, Baseball, Clu Clu Land, Clu Clu Land D, Donkey Kong, Donkey Kong 3, Donkey Kong Jr., Donkey Kong Jr. Math, Excitebike, Golf, Ice Climber, The Legend of Zelda, Mario Bros., Pinball, Punch-Out!!, Soccer, Super Mario Bros., Tennis, and Wario's Woods can be played in the game. They can be acquired through Game Boy Advance connectivity, e-Reader, and secret codes to Tom Nook. However some can only be obtained with the use of a cheat device which can also unlock all of them at once.
Contributed by KnowledgeBase
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If you you use an Action Replay, you can access the paper airplane item in your inventory. If you place the item on the ground, walk off screen, and come back, the paper airplane will duplicate itself. Pressing the A button while on top of the paper airplane will make it disappear visibly, but will still exist in the system's memory. Letting the airplane multiply too much can crash the game.
Contributed by Rainbow Pancake