Forbidden Zone (1982)
A classroom scene features a slightly rewritten version of the musical number "Swinging the Alphabet" from the classroom scene in Violent Is the Word for Curly (1938).
All of the Fleischer brothers' Betty Boop cartoons are clear influences on the Forbidden Zone's visual style. But this version of the fairy tale, much of which is set in an underground cave, also features an animated skeleton (voiced by Cab Calloway) singing "St. James Infirmary Blues".
One specific camera shot (through the skeleton's mouth) is clearly spoofed in Danny Elfman's dance number in Forbidden Zone. Elfman is a huge fan of 30's cartoons, and has spoofed Skeleton Dance (and related cartoon shorts) quite often.
The movie poster is hanging on the wall in the cinema.
Blackface performers and Wonder Bar theme song
In Forbidden Zone, the Kipper Kids at one point appear with rubber bands around their heads and noses. Paul Reubens is a big fan of Forbidden Zone, and does the same thing (for a couple of seconds, in front of a mirror) in one of the opening scenes of Pee-wee's Big Adventure.