Noticed this in the episode "Give is a Lift" at the start one moment the chap sitting in his garden is not in view behind Foggy, a few seconds later he is, sometimes setting up these small scenes takes a while so things can change
Graham certainly gave the car a lot of love and attention, many fans were proud to have a seat in it at the 50th, I think it was @Barrychuckle who helped polish it and took the door mirror off