Revealing mistake: In the dungeon fight, Lee knocks one of Han's henchmen onto the bars of the cell and the occupants grab him. It can be seen that the "metal" of the cell door is bending.
Revealing mistake: When Han's daughters/bodyguards are throwing daggers at the apples in the banquet room, one girl just blows the dagger out of her palm and catches the apple in mid air impressively. However a keen eye can see the wire attached to the dagger that pulls it from her hand (slow-mo is not necessary).
Continuity mistake: During the scene where we see Bruce Lee's sister being harassed by a group of men, at one point she kicks a man in the groin, he starts to fall and she turns around. Then the angle changes and again she turns around as the man falls.
Visible crew/equipment: Just before we see Bruce's sister commit suicide, there is a shot of all Ohara's goons running towards the shack where she is trapped, and in this shot the shadow of the camera is cast on all the men who run by it.
Visible crew/equipment: The head of a crewmember is visible during the mirror room fight. During the part where Lee is slowly moving across a mirror (just before he turns down the corridor and Han comes up behind and slashes his back), look down the corridor where Bruce is about to turn down and you should see it. Also after Han slashes his back Lee turns around and goes back down the corridor and you can see this crewmember again but more.
Continuity mistake: Parsons is fighting Williams. There's no bruise on Parsons' face to begin with. He falls with his back to the floor, and magically develops a bruise on his face after he gets up.
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.
Visible crew/equipment: During the banquet the camera pans around the room to various scenes, one of which is Roper having a drink and next to him is a circular steel ornament that reflects all the stagelights that are pointing at the action.
Revealing mistake: When Han kills Williams with a final blow, he slips off his glove, which reveals a metallic hand. When the camera zooms in on his hand, you can see the fingers wobble slightly. Metal will not do that. It's either his hand or some form of rubber/silicone.
Visible crew/equipment: At the first tournament fight, a woman holds a bowl of fruit up to Han and reflected in the underside of the bowl are the feet of the camera operator.
Factual error: During the flashback explaining what happened to Su Lin she has an ugly bruise on her face less than a minute after being hit. Bruises usually take at least a few hours to develop like that.
Revealing mistake: When Lee's sister is seen running from the men pursuing her, she falls down and you can see the stunt mat she falls on. It looks like the makers tried to cover it up with some dirt but if you look at the lower left corner you can see the green fabric of the mattress where they missed a spot.
Revealing mistake: After the four guards have been killed by Bolo we see the body of one being dragged away by his feet, strangely the "dead" guard still has one of his arms raised and even raises it a bit higher a few seconds later.
Continuity mistake: Just before Roper fights Bolo there is a shot of Bruce backing away with his arms at his sides, then the shot changes to a POV from Bolo and instantly Bruce now has his arms folded.
Audio problem: You hear a clunking of metal when Hanh hits Williams, especially when Williams throws the side kick. Clunking of metal can only be heard when metals clash. Even when metal hits rock, a different sound is made. So when flesh or bone clashes with metal, this sound cannot be made.
Continuity mistake: Near the end of the movie Bruce Lee fights underground with a track suit bottom type trousers. He is then captured, and in the next scene he is wearing baggy flared tracksuit trousers.
Continuity mistake: At the beginning of the end fight scene between Lee and Han, Han has a black glove on his right hand. We then see a few shots of his hand with no glove on, and then it returns again for the rest of the scene.
Revealing mistake: When Han is impaled on a spear, we can briefly see he's strapped to the mirror as it turns.
Visible crew/equipment: Near the end of the movie, Bruce Lee knocks Han to the ground and then the shot changes to show a frontal view of Bruce. He then lands a kick to Han's head that sends Han flying across the room. As Bruce moves towards the camera you can see a pointy object on the left side of the screen that a crew member must be holding, because in the next shot there is no pointy black thing in Bruce Lee's path. (01:34:30)
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)
Answer: Yes, he filmed all of his scenes before he died. He died on July 20, 1973 - only six days before the film debuted in Hong Kong, and only a month before the film's US debut.
TedStixon