 CONT: At the very beginning, during the television exclusive on the  missing film makers, there is a shot of the group by a seaplane,  where the introduce their guide. Mark is to the far right, doing  maintenance on his camera (so its shut off). However, when  Professor Monroe views the teams film reels, one of the reels shows  that same scene as shot by Mark on his camera. This would be  impossible since Mark was shown working on his camera in the first  shot.