When the Beetle goes into the river, it is a different older car. The first one seen is a Jeans Special Edition, which had denim seat covers, and theses days is much sought after. The one which goes in the river is a much older car.
Larry and notably Robin's positions alter in the shot change as Tripp asks who lives at No 4 when out on the street.
When Bill Maynard as The Chef does his Tommy Cooper impression 'Abracadabra', to change a dish, when it cuts from a wide shot, to close up, back to wide shot again, in the wide shots he has a cigarette in his mouth but in the close up he doesn't.
When Larry is driving Chrissie and Robin to work there are no windscreen wipers on the VW Beetle when shown in close-up.
When Larry mounts the curb to avoid traffic at a junction, he turns the wheel right but the car goes on the left-hand pavement.
When Mildred is washing her car parked in front of the sign Myddleton Terrace the original and true sign can be seen behind a dustbin.