Speed (1994) - 4 questions

Question: I don't quite understand the part of the movie regarding the camera recording inside of the bus. It seems obvious they can pick up the signal to the bus via UHF, then tape it, then make the loop so the same tape runs over and over, fooling Dennis Hopper long enough to facilitate the rescue. But how do they transmit the images from the loop back to Hopper's safehouse?

Answer: Payne obviously has some sort of transmitter attached to the camera, feeding the picture back to him. By broadcasting from the much more powerful TV van transmitter on the same frequency, they would effectively swamp the camera signal with their own, so Payne would see their looped tape, rather than the real images from the camera. Although not shown, Jack could also simply have disconnected Payne's camera as soon as the looped tape ran, to prevent the possibility of the real signal getting through and revealing their ruse.

Question: How many people were on the bus throughout the movie (counting Jack, Annie, Sam, & Helen)?

Answer: There appears to be 20. On IMDb, some have character names and others are listed as "bus passenger".

Question: When Jack is fighting on the roof of the train,he makes the quip "yeah..but I'm taller" just before the other guys head is knocked off. What does he mean by this? He was laying down at the time, height doesn't come into it.

Answer: He's taller now because he has his head while the villain does not!

Question: How would you get on the roof of a moving subway? We don't see it in the movie (Jack looks up and starts to climb - cut - Jack is on the roof.... Howard cries 'I'm coming for you Jack and runs - cut - Howard is behind Jack on the roof. after the fight when Howard 'lost his head' - cut - Jack is inside the subway again...).

Answer: Ventilation shafts or roof panels.