The dagger at the L.A. Massacre that's lying on the ground getting his broken leg taken care by medics is pro skater Jesse Martinez. He had really broken his leg and the medics taking care of him were not actors but real medics.
Catherine Hardwicke began her career in motion pictures as a production designer on this film. After becoming a film director herself, her second film would would be the period skateboard film Lords of Dogtown (2005).
Alan Sacks: During the Hollywood Boulevard skating scene he can be seen three different times. He is wearing sunglasses, a black leather jacket and black trousers. He can also be seen in the crowd watching the Ramp Locals skate the half-pipe at the start of the movie.