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.
Who Made a Bit of a Splash in Wales Then? - S4-E5
Visible crew/equipment: Foggy going down hill in the wheelchair heading towards the pond and over his right shoulder (for a split-second) is a crew member holding on to a thick piece of rope attached to the wheelchair.
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.
Continuity mistake: Cleggy has at least 2 different sofas and armchairs in different shades of leather, and his letterbox moves from the bottom of his door to the middle.
Merry Christmas, Father Christmas - S9-E14
Revealing mistake: When Compo, dressed as father Christmas, falls off the roof and down the ladder knocking Seymour and Clegg over, it is obvious that Compo, Seymour and Clegg have been replaced by stunt doubles.