When everyone is sat down at the table in the caravan Neil can be seen holding a bottle of Tomato Ketchup. However a few moments later he no longer has the bottle of Ketchup and asks Jay's mum to pass him the bottle of Ketchup which is now situated on a shelf next to the table.
When Simon is paying at the counter of the gas station, the cover of the porn magazine that the clerk is holding changes between shots.
Mr. Gilbert removes the bin from Will's head, places it on the pool/snooker table and leaves the room, there is no evidence of the bin on the pool/snooker table.
The shot of the car on the A2 on the journey home at the end is the same as the one earlier on when the car was speeding up to 100mph on the way to Camber Sands. You can tell by the cars around the Fiat.
At the very end of the episode, where they pull over and get out of the car, after Simon says "I want this clean now!" Neil and Simon argue and Simon's voice obviously doesn't match up to his mouth. Also it doesn't sound like him.
The road sign on the A2 that gives the destinations is clearly a false sign. Camber Sands isn't actually a town, its just Camber and the A2 goes in a different direction. From roughly where the show is set, west London, they would have used the A21.