Super Mario Bros. 2

The title screen music is a remix of the song from the Water levels in the first Super Mario Bros. game.

Originally released in Japan as "Dream Factory: Doki Doki Panic". The original Super Mario Bros. 2 was only released in Japan and was released in America in 1991 as a part of Super Mario Allstars under the title of "Lost Levels." In 1988, Doki Doki Panic was altered by Nintendo to fit Mario, Luigi, Toad, and Princess. In addition, the Americanized version was released in Japan under the title "Super Mario USA."

The original Beta version of the game featured a remix of the Super Mario underground theme in the underworld level that increased in tempo as the level progressed. The version released to the public used a slowed-down remix of the Doki Doki Panic underworld theme.

During the character credits, Ostro and Birdo's name's are switched, leaving Ostro's picture labeled "Birdo" and Birdo's picture labeled "Ostro." The game's instruction manual also contains this error.