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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.
Within the game's data is an unused conversation between Seymour Skinner and Agnes Skinner. It is about an answering machine message. This is the transcript:
Seymour: "You have reached the Skinner residence. Please leave a concise message at--"
Agnes: "Seymour! What are you doing?"
Seymour: "Recording an outgoing answering machine message."
Agnes: "Without my permission? You're grounded!"
A modified version of Agnes' last line here can be heard in Level 7's ghost playgrounds, but it is hard to hear.
Almost every playable character has unused voice clips that would have most likely played when they destroyed a wasp camera. Homer is the only one to use the voice clips, although it's actually used for destroying power couplings in the "Blind Big Brother" mission in Level 1.
There are three audio tracks in the game's files that are labeled "land_of_choc_main", "land_of_choc_end_neg", and "land_of_choc_end_pos". "choc" most likely stands for chocolate, and while this song is played during one of the game's missions, it does not involve chocolate, and neither does any other mission or area of the game.

However, the song was later used in the introductory cutscene to the level "The Land of Chocolate" for The Simpsons Game.
Attachment The main menu will feature one of three holiday themes if the system's clock is set to specific days of the year:
• October 31st - Halloween
• Last Thursday of November - Thanksgiving
• December 25th - Christmas
Attachment On the box art of The Simpsons: Hit & Run, Bart wears a blue shirt with a noticeably darker shade than the blue shirts he wore in 90s-era merchandise. In the game, he wears his orange shirt from the show.
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