Carry on Camping (1969)

Revealing mistake: Although the movie 'Carry On Camping' is supposed to have been set in the summer time, it was actually filmed in November 1968, during a spell of very cold weather. You can actually see the cast's breath in the cold air at some points. The field in which the famous "flying bra" sequence was shot was so muddy, that the mud had to be sprayed green to make it look like grass.

Mrs. Fussey: Joan may think you're a gentleman but personally I've got sore misgivings.
Sid Boggle: You ought to put some talcum powder on them.

Trivia: This film was set in the summer time but recorded in November and the field they set the film in was so muddy they had to spray paint the mud green so it looked like grass.