When Danny and Andy arrive at the scene of the first shooting the car is very dusty with a single red light in the front (inside). They drive to the scene of the second shooting and then the bar. In those scenes the car is completely clean with two red lights in the rear of the interior of the car.
When Sylvia converses with Andy about contacting Dornan about an old case, the tuft of hair hanging from the front of her heads keeps changing position from the front of her left ear, to over the ear, to above her left ear.
From the time Sgt. Dornan enters the 15th Squad through the end of his conversation with Sipowicz, his uniform collar numbers that indicate what precinct he is assigned to keep changing back and forth from 27 to 15 and back again.