Nothing too special in that first song really. He did some really hard attacks on down strums, missing the bassiest notes and played only quarter notes on the on beat. No problem, you can practice that and get it down cold in a few days or weeks probably.
The thing where he slides up the neck - all he did is start at the octave of the root of the chord, hit just that string with the pick and then slide his fret finger up the neck until he got to the chord, which he strummed when he got there. It's a bit tough to get the slide down (I haven't yet), but if you practice it you'll have it fairly quickly.
As far as the windmill of his forearm - that's just show. It doesn't affect the sound at all.
Otherwise, he was pretty much playing straight chords throughout. He didn't even do any bass note shuffles, hammer ons, or switching up to sevenths, all of which YOU can do to spice up the song when you play it and sound even better.
Seriously, if this is the guitar player you want to be, you can do it. He's good, no doubt, but there's nothing that I'm seeing that good solid practice won't do for you. There's a million guys who play as well as he does spread out in garages, campfires, and back rooms of guitar stores. Most of those folks just won't get in front of an audience. The one thing he does do very, very well is maintain a steady tempo. To get the steady tempo thing in your mind, you really have to practice with a metronome. There's no other way.
- Zurf