Last of the Summer Wine (1973)

Barry's Christmas - S12-E11

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.

Crums - S10-E7

Seymour: People don't realise there is an imposter running around town pretending to be Father Christmas.
Clegg: It happens every election.

Trivia: Peter Sallis is the only actor to appear in all 295 episodes of the show.