It's a weird thing to point out, but this was the first time we've ever heard Peter laugh on the show.

And what a moment. *huahuahua*

But thinking of it, that laugh was probably the most natural reaction to being shot and rather unexpectedly becoming whole again in a matter of seconds - it happens on TV all the time and the reaction is usually a lot less dramatic in nature, but this feels refreshingly like what would probably happen.
Sylar requesting to be called Nathan. So totally unexpected. Nice one.
Sylar in the mirror cabinet (is that what you call it?) Great scene.
And the kid who played Jeremy - he did really, really well. Must be tough for such a young actor to play such a completely messed up kid believably, but I totally believed it. Kudos.