During the secret "Out of this Dimension" level, listening carefully to the music that plays throughout reveals the level's theme to be a distorted version of Johann Strauss II's "Voices of Spring" waltz. The giant slot machine's battle theme is a mix of several folk songs: the Japanese folk song "Yuki", the American folk song "When the Saints Go Marching In", and the German folk song "Hänschen Klein". As the fake credits roll after defeating the giant slot machine, a distorted rendition of the credits theme can then be heard.