The registration plate of the red Audi changes from LK58 DYJ to ND56 RNX when Bishop and Pike drive it to the docks, but then changes back to the former when they reach the docks.
During the car chase in the later part of the episode (after breaking out of the traffic jam) the registration number of the red Audi changes from LK58DYJ to ND56RNX and then back again.
When the lads are chasing the red Audi estate you see the number plate, they catch the car and drive off in it and the number plate changes and then as they get near to the docks it changes back to what it should be.
The blue BMW pursuit vehicle's front airbags go off after the car performs a rapid drifting maneuver to prevent a collision with a van. Airbags go off depending on G-force sensors and direction, only achievable with a significant collision,.
Also, there is no visible dust after airbag deployment, evident that they are not genuine.
The two red Audi's discussed in the continuity errors above are both Diesel engine models. The sound effect, however, is of a Petrol Turbo model.