Other mistake: After the part where Cockburn explodes to bits on a mine, Speedman finds and picks up his walkie talkie as Cody is trying to communicate through it. The device is not only smoldering hot, causing Speedman to have to drop it, but it even appears to be melted. With the amount of heat it went though, much less the jar of the explosion, it should not have been still working at all. The 'actors' should not have heard Cody though it. Not only this, but the establishing shot of it on the ground shows the antenna snapped and broken over.