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File:Vivian - Paper Mario The Thousand-Year Door.png

• In the original Japanese version of Paper Mario: The Thousand-Year Door and some translations, Vivian (pictured) is depicted as transgender, identifying as female but, due to the age rating the localizers were aiming at when translating the game.
• Mario's creator Shigeru Miyamoto and voice actor Charles Martinet are referred by him in the end credits of Mario vs. Donkey Kong.
• Near the end of Mario Takes America's development, the developers made multiple "backup" edits should they lose the Mario license. One of them featured Sonic replacing Mario.
• In Super Mario Odyssey, Hammer Bros are revealed to have blue spiky hair with yellow tips underneath their helmets, similar to that of a Chargin' Chuck.