Continuity mistake: The 3 wheel van has a breakdown and pulls up onto a pavement outside a sport shop. Del and Rodney investigate the problem. A few minutes later there is a wideshot of the vehicle, showing it's in the middle of the road, nowhere near a sport shop. (00:39:30 - 00:42:50)
Continuity mistake: At the time Damien appears in the lounge with a baseball cap on, asking Rodney if he wants to play war, the shot shows him with his cap slanted to the left, next shot it's to the right and finally it ends up being straight on his head. (He was obviously quite fidgety behind the scenes).
Chosen answer: An apparent long string of illnesses.