During the chase where the Sweeney are pursuing the stolen lorry, during which the yellow Rover overturns, Regan's car hits a kerb. Bill says "a wheel's gone" and it is seen to be an awkward angle, suggesting that the steering and suspension have been severely damaged. However only four hours later the car is seen as good as new when the body of the lorry driver is discovered. Damage such as this would take longer than a few hours to repair.
The shotgun fired at the Constable is obviously not pointing at him, and is in fact aimed high over his head, making it unlikely he would have been hit.
When the bales of straw fall from the hayloft, several boxes supposedly full of brandy fall and bounce, showing they were in fact empty.