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.
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?
Continuity mistake: After Bruce has scared the radio controllers from their booth with the cobra we see him calmly resting his palm on his cheek. Cut to another shot of the radio guys splitting and his palm is more at his temple. The shot goes back to him and it's on his cheek again.
Continuity mistake: In the fight with O'Hara, Lee sidekicks O'Hara and sends him flying over backwards into the crowd. The brown bottle is left standing upright. When they cut back to O'Hara now reaching for the bottle, suddenly it's on it's side spilling the contents. (01:20:00)