A. In one shot, Rafe's face had blood on it, in the next one it had vanished.
B. Danny was wearing his badge the wrong way round in one of the shots.
C. You could see some of the stage people and their equipment in one of the shots of the film.
D. You could see that they were not using real guns.
C. Because during the attack on Pearl Harbour, when the people are jumping off the ships, you can briefly see a crew member (dressed as a sailor) holding a camera (covered in green plastic) floating next to him in the water.