Xian si jue

The English subtitles on the 2021 Blu-ray release by Eureka uses names for the Japanese characters that are different from those on previous releases of the film. Norman Chu's character, previously known as "Hashimoto", is here referred to as "Miyamoto Ichiro"; and the character played by Eddy Ko, previously known as "Kenji", is here called "Kaneda". According to the audio commentary by Frank Djeng, the translated names used on previous editions were incorrect, and the new edition's replacement names are more accurate.

Wires are noticeably visible in some shots during the final battle.

UK VHS versions of this film were cut by 5 seconds to remove all shots of shuriken (ninja throwing stars), as these were on the no-no weapons list of the British Board of Film Classification (BBFC) at the time. When resubmitted to the BBFC in 2004 under revised guidelines in which shuriken were no longer a problem, the film was passed uncut for the UK DVD release.

Featured in The Best of the Martial Arts Films (1990)