When O'Neill and his group find Major Hawkins, none of their P-90s have bullets in them (P-90s have translucent magazines and the rounds can be seen easily) or they have blacked-out magazines. Later, when O'Neill and crew are by the lake, all of them have regular, fully loaded P-90 magazines.
When SG-1 and 2 first get to the planet, Colonel O'Neill refers to Major Coburn as "sergeant" and, later, Teal'c refers to Coburn as "lieutenant".