I liked that Zylar as Nathan had more morals than the real Nathan, who probably didn't have his memory wiped by the haitian, and probably got his mother to clean up the mess for him.
I don't think they ever mentioned Nathan being a fighter pilot before, is that a top gun reference?
Yeah Hiros bit was beyond stupid, considering how using his power is meant to be whats killing him, although I did like the on subtle aspect of it.
WHen he first goes up on the roof he is so terrified of heights he can barely look over the edge, but by the end he is so used to it he can sit with his legs over the side.