After the "Last Road to Hell" sequence, the female executive tells Professor Monroe that the footage was "all a put-on" and "there was no enemy army approaching." The Last Road to Hell sequence is made up completely of execution footage, with no soldiers acting or enemy army approaching. The script originally called for footage of Vietnamese rebels firing at approaching troops, but execution footage from Nigeria was used instead.
At the very beginning, during the television exclusive on the missing film crew, the group is near a seaplane, introducing their guide. Mark is to the far right, doing maintenance on his camera, which is shut off. When Professor Monroe views the team's film reels, one reel shows the same scene as shot by Mark on his camera.
During the impalement scene, the lower portion of the "stick" is perfectly smooth and straight, while the portion through her mouth is rough and somewhat jagged, like an actual tree limb. The upper part should also exit through her eye sockets.