Gourmet Night (a.k.a. Gourmet's Paradise) - S1-E5
Continuity mistake: When Basil's car breaks down for the final time after reversing away from the van, watch closely on the garden path of the house right next to the car. The garden gate is open, and you can see it swing shut (look at the black shape just above the hedge) just as Basil says "One, two three." The gate was shut when he first reversed around the corner, but was open again after the shot cuts back to the car (after it's moved to the right along the pavement).