At the start when the police flee their white car due to gunfire, it is intact. But when seen next as the robbers make their getaway in a car, that police car somehow has a dent in the driver's door.
In the shoot-out scenes, when Zak is running towards the camera and is about to be shot, the sharp outline of the mechanism to fake the gunshot wound can be seen clearly underneath his shirt.
At the start how does Zak (who then tells the other crooks) know that it is the police coming? The policemen are detectives in plain clothes and their cars are unmarked with no siren or blue lights etc.