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.
Revealing mistake: During the fight scene between Han and Bruce Lee toward the end of the movie, Bruce Lee knocks Han to the ground. The shot changes to show a frontal view of Bruce as he lands a crushing kick on Han. It looks like Han was replaced with a dummy for this shot, as Bruce's kick seems to just send Han across the room. As I reviewed the scene, I could see that Han was actually a dummy of some sort .
Continuity mistake: During the fight scene in the mirror room, Lee starts to punch and kick the mirrors. During several shots, Lee is wearing shoes that fully cover the top of his foot. In others, he is wearing a pair of shoes that have a V cut down the top of his foot which you can clearly see with his white socks.
Revealing mistake: In Han's first scene, when he enters the banquet hall to welcome fighters he holds both arms out and the fingers on his solid metal hand are spread. Later on after beating Williams to death he takes off his glove to reveal his metal hand. Look at the glove before he does this; he moves his fingers.
Continuity mistake: Someone got a little makeup happy. In Han's office, Williams beats up a few guards and then Han takes things into his own hands (or hand as it turns out.) As they fight, there is a shot of Williams head-on just before Han hits his birdcage. Williams has a bruise under his eye. But why? Han hasn't hit him yet and neither did any of the guards. Nor was he hit in the face during his match with Parsons earlier in the film. I suppose it could be a shadow but it doesn't look like it.
Continuity mistake: When Bruce has the battle underground he has black socks on, but when he is captured and they show him being untied outside he has white socks on.
Continuity mistake: When they're fighting in the mirror place, Bruce gets slashed on the face. The space between the cuts is narrower than the cuts he gets from the same claw when he gets slashed on the belly.
Continuity mistake: During the fight scene near the end of the film between Han's white clad henchmen and the black dressed good guys, there is a shot of a guy spin kicking another that is shown 3 times. Many other shots are shown more than once, from close up or a slightly different angle.
Continuity mistake: During the flashback with Su Lin: Just after she starts running away from her attackers she trips and falls on a patch of dirt. Everything around is concrete and that patch is the only dirt visible. Isn't it lucky she had something soft to land on?