The Long Legs of the Law - S2-E1
Revealing mistake: At the very beginning of the episode, Leonard Pearce is waiting for the cue for his character to start looking for his teeth. He's standing in the living room, between his room and Del and Rodney's room. (00:00:25)
Revealing mistake: When Rodney first meets his new girlfriend, watch as he says "Pleased to meet you Irene". He spits on her. Not a great first impression.
Revealing mistake: When towing the car, the tow rope is slack, showing the van is not towing the other car. (00:05:45)
The Long Legs of the Law - S2-E1
Revealing mistake: When Del drops all the cutlery, if you watch you can see David Jason is holding it in his hands ready to drop. (00:07:50)