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• In Paper Mario: Sticker Star, when Mario reaches the end of a level, the Comet Piece will turn yellow, regardless of which color it was when Mario got it.

• Concept artwork from New Super Mario Bros. Wii (pictured) shows that a power-up that resembles a chicken suit was originally intended to be in the game, but was eventually changed into the Penguin Suit.
• In Donkey Kong Country Returns and its remake, Mr. Game & Watch can be seen background of Foggy Fumes.
• Mario was meant to appear in the Disney movie Wreck it Ralph, but the idea was dismissed since the writers couldn't think of a suitable way to incorporate him into the movie; he is mentioned once, however.
• In Super Mario 3D Land, when using the statue transformation, Mario holds up his right hand, while Luigi holds up his left.