Sergeant Dudfoot rips off the silver top of the helmet belonging to Constable Harbottle to use its as a funnel to fill the police car with petrol.
However, in the next scene we see that Harbottle is wearing his helmet complete with the silver top.
The scene of Harbottle submerged in the water fades into the next scene where he is lifted out of the water to give the impression of continuity.
The London Transport bus which the threesome chance upon to chase the smugglers has blinds with Liverpool Street as the terminus although they are clearly in deepest Surrey and a long way away from their supposed route.
When the police car runs away from the flaming hearse Albert is seen in front of a back projection driving in reverse though he is actually looking straight ahead.
When the garage door opens 'spontaneously' the wire used to pull it open is visible.