Visible crew/equipment: At the start of the film, just after the war exercise, when the Sergeant begins yelling at the recruits you can see the outline of his microphone under his T-Shirt. (It's not his dog tags because you can see the shape and dog tags are not shaped like that.)

Other: When the bunch of soldiers find Dr. Paul Foster, one of them removes the doctor's briefcase from the crack in his skull. In this scene, Foster's eyes are open and seem to be red. Before and after this scene, when you can see the eyes, they are clear white. The briefcase doesn't have any trace of blood on it, though it was in the bloody skull crack. The blood looks too reddish. If it is some hours old, it should look darker.