Ha! Brilliant. I think my favourite bit is the Emilie Parker Facebook page. Before showing it he says something along the lines of "what was this father doing that day? Setting up a donation fund, that's what!" then highlights a bit saying the page is to help them with their beautiful daughter. He somehow neglects to mention that the rest of that sentence makes it very clear that it wasn't Emilie's dad but who set it up but someone else who did it on his behalf. He then highlights another "suspicious" quote saying they don't know if the poor girl is still in the school or the hospital, as though this sentence is evidence that they don't know if she's dead or alive. Again, reading the whole sentence makes it very clear that they're talking about the wherabouts of her body, they say they know for certain she was a victim.
The great thing is the creator must have read these quotes in full and is obviously deliberately misleading people and so utterly undermines everythign else he says. I only watched the bits recommended by the OP and it's all utter, utter bollocks. The only thing that isn't very easily explained is the pages created 3 days before the shooting but the surprisingly blatant lies earlier in the video make have ruined the tiny bit of creedence I might have given him. What an arsehole.
Edit: Not that I find the facebook profiles the least bit suspicious, I'm sure there's an obvious explanation for them but they're the only thing that I couldn't immediately recognise as bullshit within a couple of seconds. I was really just using them as an example for how these people discredit themselves. Another highlight of the video is how well the opening lines about how this is a factual vidoe not designed to offend or push an agenda tally with the screaming "China wants gun control in the US!" headlines at the end. Wonderful stuff.