Summer Holiday (1963)

Plot hole: When the gang go out for the night, Don tells the girls that they have 30 minutes to get ready, but there is no way that Mimsy (the blonde one from the singing trio) did her hair the way she does in 30 minutes, plus got dressed.

Trivia: In the scene where the whole gang go waltzing on their big night out, you can see Don accidently drop Barbara when he attempts to flip her over on the dance floor.