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There is an entire animation and character rigging file for the character Aiai from Super Monkey Ball 2 in the game's data. This may simply be a remnant left over from development for testing purposes, as the game runs on the same engine as Super Monkey Ball.
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A graphic entitled "Rainbow Road" can be found in game, and seems to be the original name of the course "Phantom Road". "Rainbow Road" was a course in the previous F-Zero game, F-Zero X, which itself was a copy of Mario Kart 64's Rainbow Road.
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