Director Rob Cohen has two cameos, first as the horse-riding Colombian and later as the voice of the telephone caller who informs Yorgi that XXX is a spy. See more...
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In the fifth shot of the amazing bridge stunt, an Arriflex camera with yellow cords hanging down from the camera is visible, off to the left of the screen. Also, in the same shot at the beginning of this shot (in the upper lefthand corner) you can see a guiding ramp setting the car to go off the bridge.
When Xander is jumping from the plane with the snowboard attached to his feet he does some aerial moves. When he is finished them and about to pull his parachute cord you get a shot from up above. On the ground you can see the shadow of the helicopter that is there to film the aerial shots of the scene.