http://www.avclub.com/articles/felina,102961/

The directorial care and the way Walt is treated as a ghost gliding peripherally into scenes stuck out to me more on 2nd viewing. Really good work by Gilligan as director this episode.

Also, one of the funniest moments in a long time, right after Walt's "pop!" to Elliot and Gretchen, is the way he mumbles: "Darkness." Man that was great.

K