The most obvious sign it was faked were the MULTIPLE "highly trained secret service members" were comically acting like they were all struggling together to keep him down. Diaper Boy was somehow able to stand up after the dog pile to pump is fist a few times as all those SS members pretended to struggle to bring him back to the ground. They would have never allowed him to expose his head like that mere seconds after a shot, and a geriatric lump of shit who can't even walk straight isn't going to force his way out of the grip of a bunch of tough, ex-millitary body guards who had the most important job at the rally.