Audio problem: When Parker and Sid are fighting on the rooftop at the end, watch and listen because when Parker jumps to the rail where Sid is. After managing to barely climb over the rail, he punches Sid. About two seconds later, the punch sound takes affect after the scene is gone.
When Denzel Washington is injected with the tracking device,it is injected behind his ear. But later, when he looks at his cop friend and says something to the effect of "Get my gun", the band-aid is on the side of his neck.