Help! (1965)

Continuity mistake: In the scene where the Beatles are in bed sleeping, and Ringo is getting pulled out of bed by the ring, he falls out of bed, and brings the blankets with him. In the next shot however, the bed clothes are back on his bed.

Professor Foot: It's the brain drain, his brain's draining.

Trivia: At many points in the movie, the music playing in the background are slightly different versions of the song "A Hard Day's Night." This was the title track from the Beatles previous movie.