I remember deep diving on this and finding out the Zapruder films are fakes. No one really knows what happened that day as it was actually all Audio with a follow up film produced later to fit the narratives given. Many always talk about filming technology being terrible back then as well as disguises, but they have purposely delayed public technology while showing intentionally bad effects and disguises in movies. This makes us think anything else we see in film or picture is real.

Anyway, this topic is quite the rabbit hole.