Revealing mistake: When the stripper appears from the changing room during the cabaret scene, the stripper music is heard, but if you look carefully the tape recorder which is supposed to be playing the music is not actually moving.
Continuity mistake: When Fred and Ernie return to their caravan and find their dinner is on fire, they enter the caravan and you can see the door is open. A few shots later, the door is closed without no one having touched it.
Trivia: Joan Sims' foul-mouthed mynah bird's voice is provided by the director Gerald Thomas.
Trivia: In the butcher's shop scene at the beginning of the film, Fred rescues Ernie who has been locked in the freezer overnight. Jack Douglas was covered in frost effect plastic for the scene, but the rest of the cast/crew felt he had got away lightly, and threw him into a river.