Deliberate mistake: Rather than using real Bruce Lee footage only for the final fight scenes, so the undisguised Billy Lo's different appearance might make sense after his surgery, the filmmakers instead spliced real Bruce Lee face footage throughout the early film giving the character a constantly changing face from scene to scene.
Dr Land: So much for the weather report. I'm not the only one who just arrived. How about your trip to Berlin Stick?
Stick: It went pretty much as you figured. Now that he's the big star, I couldn't reason with him. He said he was pulling out and he threatened me.
Dr Land: Oh my my my my. The rest of it was in the papers. That's when he committed suicide huh? Haha.
Stick: He just got up and jumped out of the window.