Revealing mistake: In the Trotter's flat at the start, in some shots, you can see the mirror has been bent so you can't see the camera's reflection.
Continuity mistake: When the policeman stops the car, when you see him through the front window of the van, he has a torch in his left hand. When he moves towards the van he hasn't.
Audio problem: When Del, Rodney and Grandad are in the cottage, Del is scared to open the door. Rodney says "Well go on then Del, there's nothing to be frightened of now." There is a shot from behind Rodney when he begins to say this. Look closely at Rodney's mouth when he starts to say this; his lips aren't moving.
Revealing mistake: In the opening scene, there is no light switch in the Trotter's flat.
Revealing mistake: When Del is grabbing the snooker cue off the crazy man, you can see Del stick his thumb up for the other actor to hold during the snooker cue joke. (00:28:35)
Chosen answer: An apparent long string of illnesses.