After the victim from the ambulance runs away, Nolan and Bishop are back in their car, they start talking. During the conversation, both of their seat belts are off, but for 6 seconds during this time, Nolan's seat belt is on, then off again.
A polygraph exam is conducted by the examiner, not an officer while the examiner sits.
At 32:20, when Lucy's phone goes sliding off of the center console after she's rammed for the second time, the gear shifter is in the "park" position, something obviously not possible if she is driving the car.