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Entering the cheat code "UGLYMUGS" and viewing the game's credits will display a group photo of the game's developers, Left Field Productions.
Contributed by MehDeletingLater
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The game's memory contains unused graphics of some kind of debug font.
Contributed by MeleeWaluigi
Hidden within the rom is an unused string of text that is repeated many times:

Please don't copy this game... that would be rude. Hey!
What are you doing looking at this binary when you should be
looking after my shed?
Contributed by DeerBoarDude