Continuity: During the scene when Chris and the agents are walking along the catwalk, just prior to Chris's precognition of getting shot by a sniper from behind them: As Chris and the FBI agents are about to turn 90 degrees left on the catwalk, there is a cylindrical duct of some kind behind them with a white tarp covering the end. As they walk past it, the tarp gets sucked down and pulled out of sight - possibly a film crew action, or just part of what the machinery is being portrayed to do. However, after his precognition of getting shot, the scene rewinds to their approach on the catwalk, but this time, the white tarp at the end of the tubing does not get sucked in, it remains covering the end of the duct.
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