For the most part I think that they're all entirely nonsense and based around people searching for something that simply isn't there.

At the end of the video Lemmino spends some time talking about these, saying that they're just not credible based on so many factors. And for that I entirely agree. However he doesn't talk about the weird behaviour of the Secret Service following the event.

Now all of that could be down to Secret Service corruption, incompetence, secrecy etc etc, but it could also just as likely be on purpose.

I'm a big believer in Occam's Razor, that the simplest thing is probably what happened. As we all know the events, I fully believe that Oswald did what he did entirely as described in the video, but there are is also interesting 'evidence' that suggests that maybe one of Kenney's Secret Service detail may have unintentionally shot Kennedy in the back of the head in the chaos of everything and upon realising this, the Secret Service obviously decided to try and (successfully) cover it up.

Again, I fully recognise this theory as a conspiracy, but for me, based on what (admittedly small amount) I've seen on the matter this is the most credible. Because it's the simplest answer. Only being trumped by the simpler answer that everything happened as described.