Continuity mistake: At the start we see the purple jacketed skater stop and look at the display. The red jacketed skater stops to the left of the purple one. Camera changes to a view from inside the display and the red jacket is now to the right of the purple one. (00:02:20)
Visible crew/equipment: In the first shot at the public trap, you can see a camera crane reflected in the mirrors.
Other mistake: The 30 second timer counting down in the garage trap actually takes 87 seconds to count down. The first 17 seconds take 72 seconds to pass. (00:20:15)
Answer: Dr. Gordon from the 1st movie, and Ryan and Brad from the trap in the beginning of this movie.
derrick g