During the scene where Bruce leaves his girlfriend's parents home, it's raining. He leaves in a huff on his motorcycle and you can clearly hear the sound of screeching rubber on the pavement. Peeling out and making this sound would not have been possible in a rainstorm.
When the nightmare warrior (the big metal guy) is fighting Bruce Lee in the room full of mirrors. This is the room in "Enter The Dragon" when he fights the bad guy in the movie.