During the filming of a fight scene, Dick Wei kicked Cynthia Rothrock so hard in the side of the head that she began bleeding from her ear. At the hospital, a torn inner ear was diagnosed and Rothrock immediately returned to filming.
At the time of filming, Cynthia Rothrock was unfamiliar with the Hong Kong custom of shooting movies without sound for later dubbing. After failing to remember the very first Cantonese lines fed to her, she was surprised when the director approved the shot despite her having resorted to gibberish. Additionally, the lack of recorded sound had long since made it custom for Hong Kong performers to deliver their lines very quietly, and Rothrock's costars were surprised by her tendency to emote loudly.
This movie started a new wave of female action movies.
While working a martial arts demonstration team, the magazine Inside Kung Fu contacted Cynthia Rothrock's team stating that D & B Film was looking for a new male lead to play a Bruce Lee-esque character in a film. Despite looking for a male lead the team has a few women on their team and decided to bring them to demonstrate their skills as well. The studio producers were so impressed with Rothrock's martial arts skills that they offered her the role in the film on the spot and changed the lead from a male to female. When arriving to shoot the film, Rothrock was surprised of her role as she assumed she was going to be in a traditional period martial arts film.