Fat Chow (qv) was  almost blown up when the explosion outside the mansion door being  more powerful than expected. Some of his hair was singed, and he was  blasted forward. The shot in the film is his real reaction. Director  Ronny Yu (qv) was the stunt double in the warehouse scene. He  wrenched his back after slipping on water puddle while carrying  Dean Shek (qv). Also the stuntman for Leslie Cheung (qv) who  performed the speedboat jump landed incorrectly and broke his foot.