Michelle Yeoh Not only performed her own motorbike jump stunt, prior to filming she could not ride a motorcycle.
While filming the scene where his character hangs from the side of the train, Jackie Chan was accidentally sideswiped by the helicopter.
Jackie Chan and Michelle Yeoh got into a stunt competition during filming, which kept escalating until the former had to tell the latter that he'd end up dead trying to top her each time at the rate that they were going.
Ken Tsang was doubled by director Stanley Tong for the helicopter stunt towards the finale. As a result, Tong broke his shin and can be seen sporting crutches and a cast during the outtakes and credits.