Continuity mistake: During the car chase when the camera is inside the Sweeney Granada, a green Fiat can be seen driving in the other direction. The shot immediately changes to outside the car and the Fiat has gone.
Continuity mistake: When the squad car is on its way to Sussex to investigate the camper van, it is escorted by a police motorcyclist, but when the squad car arrives at the scene the police motorcyclist is already there and standing next to his bike.
Continuity mistake: As soon as the camper van is lifted out of the lake, Carter gets inside it and it is dry, despite the doors being open when it was in the water, and water pouring out of it while the crane was lifting it out of the lake.
Answer: Scripted.