The only Police Story film in the original quadrilogy that never received an American release by Dragon Dynasty. This is primarily due to Dragon Dynasty having the rights to the first two films via Fortune Star, and then using their previous Dimension Films cut of Supercop for the third. In fact, aside from Japan, New Line Cinema parent company Warner Brothers owns the international rights to the film.
Since Annie Wu didn't speak Cantonese at that time (she was just learning the language), all of her scenes and those of Uncle Seven and his family (including Jackson Lau) were done in Mandarin. Thus, most of this film was shot in Mandarin, not Cantonese.
Most of the vehicles used were provided courtesy of Mitsubishi Motors. In the beginning, there are several Diamantes, Galants and a couple of Lancers. Near the end, they showcase the GTO Twin Turbo convertible (3000GT VR-4 Spyder). Also, there are a few Hyundai vehicles, some of which are manufactured by Mitsubishi.
After Jackie meets up with Annie with the security guards at the elevator, the security guard talking on the walkie-talkie says that they are on the top floor, but after Jackie pushes both guards into the elevator, you clearly see the elevator going up, clearly indicating there is at least one more floor.
When Jackie climbs out of the back of the van near the beginning of the film the tailgate bounces as he closes it, revealing it was rigged in the unlatched position to allow him to open it from the inside.
Chan Ka Kui: [phone call]
Uncle Bill! I'm calling you right now from Australia and I'm having a great time! I'm talking to you while enjoying my great view. Wow! Working for the FSB is great. I have a sauna, swimming pool, and jacuzzi. Oh, wait a second. My koala bear just came out.
What are the differences between the International Version and the Hongkong Theatrical Version?
The International Version is missing about 23 minutes of footage, to get a more "enjoyable" runtime of 84 minutes. Most of the scenes that were cut out are plot-scenes, but there are also some spectacular fighting and action-scenes that fell victim to the censors. Additionally, the soundtrack was altered completely. The new music is supposed to convey a certain "James Bond"-feeling. Unfortunately, the underwater-scene no longer features the "Jaws"-theme; the Police Story soundtrack was also deleted, which is unfortunate, since the outtakes are way more fun when underlaid with the original Police Story theme. A detailed comparison between both versions with pictures can be found here.