When Troy is driving and nearly hits the cyclist, there is a shot of the interior of the car, and the speedometer needle doesn't move.
When Barnaby and Troy first get to Brighton, a car pulls out in front of them in a dangerous manner and Troy yells "Why don't you look in your mirror?", However, if the driver had looked in his mirror all he would have seen is the wall he was pulling away from. It would have been more effective to shout "Why don't you look where you're going?"