As shown beneath the closing credits, Maggie Cheung suffered a major head injury while trying to outrun the falling metal frames. Cheung was unable to finish the movie after this incident, so you never see her face. She is always shown from a distance. Crystal Kwok, who plays a policewoman in this movie, filled in as Cheung's double for the remainder of the movie.
Jackie Chan smashed into the wrong glass pane, causing severe cuts to his wrist and head. This scene is actually used in the movie, and the outtakes show the pain.
Jackie Chan's real father Charles Chan made a cameo appearance as a foot passenger in an earlier scene.
During the restaurant fight scene, one camera had been destroyed. Also, one stuntman suffered an injury when he crashed through the glass (this scene appeared in the outtakes).