Eight games developed by Rare for the Game Boy Color and Game Boy Advance feature a recurring Easter egg: a crude drawing of a bovine eating a flower. Dubbed the "Rare Cow", it made its first known appearance in Conker's Pocket Tales in 1998, and last appeared in It's Mr. Pants in 2004.

Inside the game's files is an unused Disney castle logo similar to the original Walt Disney Pictures logo. It was likely used when the game starts up as evidenced by the intro music.

There are a number of unused tracks found in the Nintendo 64 version of the game left over from the beta. The tracks are Greenwood Village from Diddy Kong Racing, Mizar Race track from Jet Force Gemini, an early version of the White House battle track titled "maze", two battle tracks called "battletest" and "cascade", an empty test map called "mushcan", and an exact copy of the practice stage possibly intended to be used as a battle track. Most of the tracks also feature the Skybox background textures from Jet Force Gemini.