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 * The North American instruction manual of Super Mario Bros. 2 stated that Birdo (pictured) is a male; in Super Smash Bros. Brawl, Birdo's trophy description describes the character as "gender indeterminate", and uses the pronoun "it" rather than gender-specific pronouns. However, Nintendo of America and Nintendo of Europe have usually referred to Birdo as female.
 * The pyramids in the background of Shifting Sand Land in Super Mario 64 are actually based on the Great Pyramid of Giza.
 * Due to palette limitations in the NES version of Super Mario Bros. 3, Fire Mario's fireballs appear green inside Toad Houses and blue during Koopaling fights.
 * In the Nintendo DS version of Mario & Sonic at the Olympic Winter Games, one of the Trivia notes in the Adventure Tour mode stated that Waluigi and Wario are actually cousins.