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 * In the Japanese version of Paper Mario: The Thousand-Year Door, Vivian (pictured) is depicted as a transgender female; this was later referenced in the Japanese version of the game's sequel on her Catch Card. In both English versions, Vivian is instead portrayed as a cisgender female.
 * In New Super Luigi U's opening cutscene, Mario is absent, and his cap is shown where he sits in the opening of New Super Mario Bros. U. This is probably because Luigi is the game's main character instead of Mario.
 * In Paper Mario: Sticker Star, when Mario uses the Boom Box sticker, a remixed version of the Space Zone music from Super Mario Land 2: Six Golden Coins will play.
 * In New Super Mario Bros. Wii, some of the coin formations resemble the "&#915;" on Waluigi's cap; many such formations appear in World 9-8.