In one shot, when the police car is being clamped, the driver's side is facing the camera. Later, the police car is shown pointing in the opposite direction.
When the police officers are asking Ian Ventham questions in his kitchen, DCI Chris Hudson's jacket changes positions throughout the scene. Sometimes the bottom of his jacket is tucked by his side and other times its folded out normally.
The newspaper report shown early in the film refers to a "home invasion", a term that was unknown in the UK in the 1970s and only gained popularity in the US much later.
The gentleman who is talking to Joyce near the beginning of the film (when the other club members first approach her) mispronounces "sudoku" as "suduko".
Joyce compliments Elizabeth's jumper. A jumper is a pullover sweater. Elizabeth is wearing a cardigan.