Ken Tsang was doubled by director Stanley Tong himself 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 film's outtakes/credits.
The first Hong Kong action film to use synchronized sound. However, on the 2009 region-1 DVD released by Dragon Dynasty/The Weinstein Company, when Jackie Chan discusses this in an interview, the subtitles transcribe the audio incorrectly.
The only Police Story film in the original quadrilogy that never received an American release by New Line Cinema. The first two films, as well as First Strike (the fourth film), were all released by New Line, while Supercop's initial release was by Dimension films.