Continuity mistake: When Elvis is at the pool singing "you're so square baby I don't care" watch his guitar player Scotty Moore sitting behind him. They use two camera shots for the scene. In one shot he has sunglasses on, in the other shot they are gone. This happens throughout the entire song.
Continuity mistake: When Fred Astaire and Cyd Charisse are dancing among the parallel bars, her skirt changes to cullottes then back again to an ordinary skirt.
Continuity mistake: When Maggie and Richard Avery leave Professor Flostre's room, she puts a beret onto a statue. About four minutes later, when Audrey runs out the room, the statue has disappeared.
Continuity mistake: When the three pigs are listening to the wolf playing his trumpet in Hell, the position of the double bass behind the pig who is playing the piano changes between shots.
Continuity mistake: The character Sid Sorokin sings the song "Hey There" into a dictograph machine. He then plays it back and sings a "duet" with himself. However, the lyrics and melody at the end of the song are different from what he sang into the machine originally.