That part after he falls out of the window ROFLMAOOOOOO THAT WAS SO GOOD
I was laughing so loudly, they got the camera angles and everything SO RIGHT, paying homage to it while also making a bit of fun of it. It was so well done. Bravo.
I think the first scene with Nathan Fillion... is kinda Nathan Fillion, not quite Nate. Nate's quips is more of a down to earth, dearly kind of snark, while Nathan Fillion is just pretty much all snark, imo. That being said, I think he did a fine job with it, especially the scenes with Elena and Sully.