In the opening credits of Hitman, there are several scenes involving children training. Many of these scenes were from footage from the first season of Dark Angel (appeared on Fox on October 3, 2000). See more...
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A stunt double for 47 got hurt on camera and yelled, very obviously. Right after the sword fight on the train the last man 47 is fighting continues the fight hand to hand under the tracks. Timothy Olyphants stunt double throws a punch and he grips his hand, yells and his face comes into screen for a moment. Next shot, Timothy Olyphant throwing his own punches.