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.
Enter the Dragon (1973)
Ending / spoiler
Directed by: Robert Clouse
Starring: Bruce Lee, John Saxon, Ahna Capri, Jim Kelly
Bruce Lee kills the one handed guy in a hall of mirrors
Trinity
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