When David calls Harris over to tell him he's breaking out, Harris shirt is first partly buttoned, then it's completely unbuttoned in the next shot.
When The Hulk first breaks out of the barracks they light him up with a spot light which he knocks over. After that Captain Holt orders for a light, it's the same clip used twice As you can see exactly the same movement made by the guard.
After David turns back to normal after the first hulk out he is wearing a belt to hold his jeans up. At 23:19 you can see as he tips the jeep over The Hulk was not wearing a belt.