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 * Mario's House (pictured) in the opening scene of Paper Mario: The Thousand-Year Door features a redesign of Mario's & Luigi's bedroom from Paper Mario; however, it cannot be fully seen in the opening scene unless the game is hacked.
 * In the Mario Party 6 minigame Banana Shake, Delfino Plaza from Super Mario Sunshine can be seen in the background.
 * In Paper Mario, before the player fights Jr. Troopa in Forever Forest, he erroneously calls himself "Jr. Koopa."
 * Wario Land II was the first game to portray Wario wearing a short-sleeved shirt.