Just before Malloy asks Reed, while on patrol, "Do you want to take a run through the park?" Reed is shown with his uniform not buttoned up all the way to the collar, thus his white t-shirt is showing just below his neck. In the next shot of Reed after this question by Malloy, Reed's uniform is buttoned to the collar with his white t-shirt no longer showing.
When out in front of the "Yard sale" house, with the in-custody, you can see black tape over the numbers on the overhead light, but a second later you can see the 1 and 012 numbers clearly.
When Malloy and Reed arrest Bannerman and place him in the back of the squad car, the head rest is missing from the passenger side top of the seat.