Continuity mistake: When the Lea family arrives at the rugby match, Tim parks the car in the car park. During the match you can see that the car has moved forward and is on the pavement. After the match, when Tony and Mary steal the car, it has moved back into the car park. Also, the front passenger window is open. It was shut when Tim parked the car.
Continuity mistake: When Sid and Tim are standing outside the Truscott driving school as Sid says "It's great, isn't it?" a red van, an orange car then a white van drive past on the road behind them. These three vehicles should have been visible in the previous angle when the camera was looking down the road in the direction they came from, but they weren't.