After becoming fed up with his Luke Wilson's slow driving, Lawrence decides to take over. When he jumps the bridge, they cut to the reactions of the actors inside the car. You can see in the background that they are not airborne, but still on the ground.
Anytime there is an overhead shot of the LAPD police cars, number 664 is always there. ML even drives it at one point, and I think in one shot where he chases the armoured car, its number is 664.