HAMMERHEAD delivered 120 shots that were used in the BUS sequence.
All interior shots aboard the bus were shot on a greenscreen sound stage.
Live action plates taken while driving the streets of New York were composited into the windows to give the feeling that the bus was moving.
To add to the realism, many of the "flaws" of reality were added including scartches in the windows, distortions and reflections.
The work turned out so seamlessly that the (self-proclaimed) "visual effects cursed" SYDNEY POLLACK claimed to want to shoot his future projects the same way.