The Dark Knight Irradiated Bills/Unrealistic Dark Knight
In the beginning of the film, Batman scans some "irradiated bills" he said he gave to Gordon. What are these "irradiated bills" and what's their use?
Also,in the car chase where Dent was supposed to be transferred to jail, why didn't the Joker aim the bazooka at the car Dent was in even if he had a clear shot at it(he hit the car with uzis before that) but shot the two police escorts first. He could have gotten the job done by firing directly at Dent's car.
Also, in the final scene where Batman munged at Dent and Dent fell and died as a result of that fall why didn't Batman die when he fell at the same height?