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.
The Pajama Game (1957)
1 mistake - chronological order
Directed by: Stanley Donen, George Abbott
Starring: Doris Day, Carol Haney, John Raitt
Mae: We ain't giving up nothing.
Katie 'Babe' Williams, Grievance Committee: Wait a minute, don't you see? We've won.