Visible crew/equipment: When Del is trying to sell the toy dogs, in a number of shots from behind the customers, the reflection of a boom mic is visible. Look to the right of the double doors behind Del. (00:01:15)
Revealing mistake: When Del is trying to sell those hooky toy dogs, there are some shots of the policeman walking across the street. The same clip of that policeman is played twice, only one is longer than the other (note a grey-haired man walk across the screen twice). (00:01:35)
Continuity mistake: When Rodney drove the van to help Del escape from the police. When you see a shot of the van from behind, the van has changed position. (00:03:40)
Continuity mistake: When Del is escaping in the van, there is a view from the side of the van and the door is almost completely shut. But in the next shot, which is a direct view of the back of the van, the door is wide open, allowing space for the toy dogs to fall out of the suitcase and onto the road. (00:03:45)
Visible crew/equipment: When Del walks in to the flat, as he answers Grandad's first question, the shadow of a boom mic can be seen moving behind him on the blue front door. (00:04:15)
Continuity mistake: Just before Del says that Rodney needs Radar, the door behind Rodney is beginning to swing open. Nobody makes any move to close it. The next time we see that door, it is firmly shut. (00:04:50)
Continuity mistake: When Rodney is talking about breaking up the partnership, his hands switch from being on his knees to the table between shots. (00:07:50)
Continuity mistake: When Del is getting chased by the dogs in the alley, some of the dogs run a different way, yet in the next shot, they are all chasing him again.
Chosen answer: An apparent long string of illnesses.