There are unused voice files within the game, suggesting that the game was originally going to feature a tag battle mode. This game mode did not make it into the final game.
Contributed by DrakeVagabond
Both playable characters have a flying fire kick move that can only be done in the Japanese version. It is unknown why this attack was removed from the international version of the game.
Contributed by ZpaceJ0ck0
Apocalypse has an unused attack where one of his hands turns into a energy weapon of sorts and creates an energy ball. The attack deals no damage, suggesting that it was unfinished.
Contributed by ZpaceJ0ck0
The Japanese version features pre-battle dialogue between Apocalypse and every single playable character. These intro dialogues were not translated and instead they were removed from the international versions of the game.
Contributed by ZpaceJ0ck0
Alongside all the available playable characters (minus Bubble), Matilda and Hal have unused voice clips, suggesting they were to be added to the roster as well.
Contributed by GamerBen144
Two unused pigs that may have been planned to be playable at one point can be found in the data, one being a minion pig, and the other a “Moustache Pig.” It’s unclear how they were planned to be programmed into the game.
Contributed by GamerBen144
In the August 2006 interview with the game's assistant producer Yutaka Haruki published in the XCN (Xbox Community Network), he stated that the team had considered allowing players to upload photos they had taken in-game to the Internet, but they were ultimately unable to implement it into the final game.
Contributed by ProtoSnake
The game was originally an arcade game titled The Fast and the Furious, which was soon ported to the Wii with any references to The Fast and the Furious being removed entirely due to Midway losing the license to the series during the game's development.
The game was going to have an extensive training mode where players are taught the mechanics of the game--from simple weapon clashes all the way up to death combos. The mode was ultimately left out from the final game due to memory limitations and time constraints.
Contributed by ZpaceJ0ck0
The game was originally going to have a story mode which took place after the events narrated in arcade mode, but it was ultimately left out from the final game.
Contributed by ZpaceJ0ck0
By swapping map files, it is possible to play the first two single-player exclusive levels in co-op mode. The first level, Roadside Destruction, plays like a regular co-op level while the second level, Chicken Con Carnage, requires player one to take control of the tornado while the second player grabs the Fire Flyers. This mechanic was eventually reused during the Vortex Race and Totem Battle segments after completing all zones.
An E3 2009 developer walkthrough revealed that the game had a removed mechanic called advance chain collecting, which completely removes the smoke, sparks, and sizzling sounds emitted from objects containing Fire Flyers. As a result, this changes the game's difficulty. It is possible to enable this mode in the Wii version of the game via modding.
According to the developer's texts left in the Xbox 360 and PlayStation 3 versions' data, Nelson Muntz was originally going to be the boss of the NeverQuest level as a troll, instead of the two-headed Patty & Selma dragon.
Contributed by GamerBen144
In the code for the "Alien Auto-topsy: Part 1" mission, there is a command called "AllowRockOut()" which can be triggered after collecting the nuclear waste barrel and parking the car while Homer is a passenger and someone else is driving (this can be performed while Homer is the driver, but is reportedly trickier to pull off). Homer can then be seen "rocking out" to the mission's music by performing the "Task Completed" animation over and over again (any other character animations will temporarily override it). However, if you cancel the mission during this animation loop, it will be revealed that the speed he rocks out at changes to accompany the tempo of the song that is currently playing. The RMS files (which control music events) contain tempo data for every song in the game, despite mission warping effectively causing rocking out to go unused.
Contributed by MehDeletingLater
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