One highlight of the episode was Quinn's line in the interrogation room: "It's obviously self defense."
That whole scene was a highlight IMHO. They knew Dexter did it (come on people, not even Quinn is that stupid...) but let him go anyway. I thought that was a great way for Dexter to leave Miami Metro.
Yeah, the whole way how Dexter killed Saxon and subsequently got away with it was kind of cool (a fine example for a double Batman Gambit btw: http://tvtropes.org/pmwiki/pmwiki.php/Main/BatmanGambit
But obviously it couldn't save that trainwreck.