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 * Artwork for Yoshi's Island DS shows Baby Bowser riding a Yellow Yoshi (pictured), which is impossible to replicate in-game.
 * In World 6-3 of Super Mario Bros. 3, 1-Up Mushrooms appear completely white.
 * In the Mario & Luigi series, Starlow is given the incorrect speaking sound effect at least once in every game she appears in.
 * In WarioWare: Twisted!, the music box world from Wario Land 3 appears in Wario's House.