Other mistake: In the briefing scene just after the main credits, Braithwaite is showing Lee a film of Han and his allies. What we are seeing is footage spliced into the film, as the shadows of the 16 millimetre projector's reels on Bruce Lee's face and the wall shows empty reels with no film in them at all.
Trivia: In the dungeon scene where Bruce Lee battles some of the guards in front of jail cells packed with prisoners, he snatches one of the guards by the hair and snaps his neck. The poor guard was a then 18 year old Jackie Chan. He was also one of Han's thugs in the light blue kung fu outfit chasing Bruce Lee's sister.