In the scene where Clark is scaling the electrical tower at Hoover dam, he is holding onto a power line as it swings down. Notice how he is holding onto the power line. His arms are bent and the power line is easily slipping through his hands slightly. Not exactly as you would exect it to happen. Then later in the same scene, the power line slaps down against the dam leaving Clark stranded. The next camera angle shows his family spotting him on the side of the dam, but when they show Clark again, the power line is nowhere in sight!!