Revealing mistake: When the toggle on the gun is pulled back that supposedly injures Captain S. Melly's fingers, it doesn't actually make contact with them.
Carry On England (1976)
1 revealing mistake - chronological order
Directed by: Gerald Thomas
Starring: Kenneth Connor, Judy Geeson, Windsor Davies, Patrick Mower
Revealing mistake: When the toggle on the gun is pulled back that supposedly injures Captain S. Melly's fingers, it doesn't actually make contact with them.
Trivia: Kenneth Connor's line, "I've been regular for eighteen years", is an in-joke about his time in the "Carry On" films. He made his debut in 1958, and when the film was released in 1976, he was in the films for eighteen years.