Jonn Costella from 2011--Explains Many Aspects of the Zapruder Forgery

Great, great interview talks about so many different sides of this. Easy to understand here, relatable explanations, especially the pincushion effect. This is one to come back to.
Simplified view is there are two theories of the Z being fake:
1. voiced by Doug Horne, that some frames were removed and others painted over, and it's a real film with alterations.
2. Costella's view that different parts of the film were assembled together or even manufactured whole cloth and that whole film is fake.