Revealing mistake: When ever anyone leaves or enters the cafe through the front door, it is obvious that the cafe interior is a set and not filmed on location due to the painted scenery seen through the door.
Last of the Summer Wine (1973)
1 revealing mistake in show generally - chronological order
Starring: Peter Sallis, Robert Fyfe, Jane Freeman, Kathy Staff
Genres: Comedy
Revealing mistake: In the final scene when Foggy is on the horse, it rears up when frightened by Foggy's bleeper, causing Clegg to jump out of the way. It's obvious that it is a stunt double playing Clegg, as he has a different hair style.
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Trivia: Peter Sallis is the only actor to appear in all 295 episodes of the show.