This is the real question for me, why would they cut out the middle of the Zapruder film?
Isn't it a little odd that all the police motorcycles are ahead of the limousine at the begging of the Zapruder film and then behind when it restarts? My understanding is that Zapruder claimed he never stopped filming
The only reason I can think of is the gap shows the parade being re-routed from Main Street (the intended route) to Elm Street (and directly below Oswald's position)