Six years after the film's release, two members of the cast appeared as character witnesses in the court case brought against Jean-Claude Van Damme by Jackson 'Rock' Pinckney, testifying based on their experiences working with Van Damme on the movie: Timothy D. Baker claimed that Van Damme was dangerous to work with and possessed inadequate control of his movements for a martial artist, whereas Ron Pohnel claimed that Van Damme did in fact possess adequate control and could perform a fight scene without complaint.
The scenes with Bruce Lee's spirit were actually filmed with Tae-jeong Kim and Kurt McKinney both speaking different languages. Kim's voice was later dubbed into English and, apparently, both actors did not know what they were saying to each other throughout these scenes - they spoke from cues behind the cameras.
The first combat sequence of the film with Jason's father (Timothy D. Baker) and Ivan the Russian (Jean-Claude Van Damme) in the dojo had Van Damme jumping off the shoulder of another villain to perform a flying kick. This kick was supposed to hit Baker's upper chest region but Van Damme repeatedly struck Baker in the face, knee, and throat instead. Baker later appeared as a character witness against Van Damme in the lawsuit filed by Jackson 'Rock' Pinckney, claiming that the poorly-performed kicks were largely due to carelessness on Van Damme's part and that they continued even after director Corey Yuen told Van Damme to be more careful.
At the time of filming, Jean-Claude Van Damme drove a very poor, beat-up car. At the end of production days, Van Damme would frequently ask Kurt McKinney and other cast members to push the vehicle to help start the engine.
Kurt McKinney learned about auditions for the movie through a notice in the now-defunct Drama-Logue newspaper. His decision to try out was made at the last moment, and by the time he arrived at the studio, the only role left over was that of the lead character. Following his audition, he was immediately cast.