When Terry goes into the house of the woman neighbour to fix her bath tap. She says she lives at number 39, however no 5 is clearly seen on the front door
When 'Bob' (Rodney Bewes) comes back into the kitchen (after answering the front door and being punched, all off-camera) he slips on the floor and almost falls over. Interestingly, it was left in and not re-shot.