In the burnt rooftop somersault stunt scene, Yuen Biao suffered a broken leg.
While filming her fight scene with Sammo Kam-Bo Hung's character, Cynthia Rothrock kicked Hung's stunt double so hard in the side of his head that he bled from the ear.
Prior to filming, Cynthia Rothrock had torn a ligament in her knee and Richard Norton had developed a severe infection from cutting his leg on a plant. Both filmed their parts but can be seen respectively performing all their kicks with a single leg.
The fight between Sammo Kam-Bo Hung and Biao Yuen proved perilous to film. Hung kicked Yuen so hard in the chest that the latter was unable to draw breath, and required assistance from Kar Lok Chin to start breathing again. Chin - who doubled Yuen in key scenes - was injured when Hung flipped him over his head and he landed on the back of his neck.
Tak-Hing Kwan originally intended to reprise his oft-played role of the folk hero Wong Fei-hung in the film, but ceased involvement over the planned usage of the character. At some point, Fei-hung was to be captured and rescued, and Kwan considered this disrespectful towards the character.