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 * Jimmy P. (pictured) from WarioWare: Smooth Moves bears a resemblance to the eponymous main character of the manga/anime Bobobo-bo Bo-bobo.
 * The Double Cherry from Super Mario 3D World was actually the result of a mistake made by a staff member with the placement tool, which created two player Marios. The staff thought it was a good idea and decided to put it in the game.
 * According to an interview given in Family Computer Magazine, Shigeru Miyamoto added World 9 in Super Mario Bros.: The Lost Levels due to the interest in the Minus World-esque "World-9" levels in the Japanese version of the original Super Mario Bros.
 * In Donkey Kong Country Returns and its Nintendo 3DS remake, Mr. Game & Watch makes a cameo appearance in the background of the level Foggy Fumes.