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 * Baby Bowser (pictured) looks and sounds exactly like Bowser Jr. in Mario & Luigi: Partners in Time, although his bandanna is different in appearance, as it doesn't have those large, scribbled jaws on it.
 * Although he doesn't physically appear in the Paper Mario: The Thousand-Year Door, Goomboss is mentioned in the Super Luigi books. However, the English translation referred to the character as the "Chestnut King".
 * Boolossus is the only Portrait Ghost in Luigi's Mansion to not have HP and he is, along with King Boo, the only Boos that are Portrait Ghosts.
 * In Mario Paint, the player can touch the O in the word MARIO, when on the main screen. After that, the O will explode like a bomb, and Totaka's song will play.