Good points. Definitely faked. The hat flying straight up is something I didn't consider before. That's probably why the comments were turned off on that video.Notice that after his first dry click, he cycles the action, and no shell ejects, even though you can see them eject after each of his live rounds.
Also, each round fired echoed prominently. The sound of the "hangfire" ended quite abruptly indicating that the report had been added. Also, his hat went straight up, not to be seen coming back down to his right. I haven't made a habit of shooting hats, but the way his hat went straight up, not to be seen coming back down, it looked like his hat was yanked up into the trees over his head by a string.