During the opening ambulance chase scene, one shot of the cuda shows the dashboard red and blue lights not on, while in the rest of the chase they are.
During the opening ambulance chase scene the ambulance comes at a car door that has just opened, with the driver looking at the ambulance. A second later the ambulance slams the door taking it off, but the driver is not seen.
During ambulance chase after it hits car door the grill gets broken.
When Nash pulls up to it the grill isn't broken.