Continuity mistake: In the scene on the way to the church when Liz and Hyacinth nearly crash into the Thorgunburys' car, there are two cars parked in the front garden of the house behind them, a red Peugeot and a white Citroen. At the end of this scene a white Vauxhall Nova has just appeared in the garden.
Revealing mistake: At the beginning of the episode, when the TV repairman is at the door, you can see that the background behind him is a studio wall - not the front yard we normally see on that side of the house. This effect also appears in many other episodes.
Continuity mistake: When the characters arrive at the pub, Richard parks the car not within the parking bay and with a big gap between the front bumper and the bollard. He then goes into the pub. Meanwhile all subsequent shots of the car show it parked right up against the bollard, and in addition a wide shot seen while Hyacinth is waiting for Mrs Fortescue shows the car is parked within the lines.
Continuity mistake: When the inside of Onslows and Daisy's house is shown there is no second door in the hallway right inside the front door. When the angry woman storms in to the house from the outside, there is a second door that she goes through after the front door. You can it because the light changes as if a door is being opened and then closed, much like a swinging door.