Trivia: In the first scene in Max's office, there is a calendar showing the date as June 16. Leopold Bloom is a character in James Joyce's Ulysses, which recounts the events of a single day. June 16th.
Trivia: At the part where the band arrives to play for the evil witch, one of the band members states "We've had the same stinking tour bus since 1978" which is referring to "The Great Muppet Movie" (made in 1978) in which they first mention the tour bus.