Continuity mistake: Rodney says that he picked up the money off the table when they were trying to escape from the police, yet if you look closely he never goes near it. And he never has another chance to pick it up.
Continuity mistake: When Sid is preparing Slater's food, keep an eye on Sid's cigarette. In one shot, it is normal length, but in the next, it is virtually gone.
Continuity mistake: When Rodney and Del are driving down the road and Rodney is talking, you see a side shot of the van and you will notice his lips aren't moving.
Continuity mistake: When all the gang are in the office near the end of the episode, Rodney goes from being by the side of Del, to being right behind him between shots.
Chosen answer: An apparent long string of illnesses.