EW.com included last night episode of Supernatural into their “13 ‘Did you see it?!’ TV moments” here what they said:

Supernatural review: Changing Channels: Sam and Dean spoofed Grey’s, CSI, and a sitcom
Supernatural may be surrounded by heavy-duty time-period competition — Grey’s Anatomy, CSI, The Office, Fringe — but it just keeps doing its demon-ganking thing, and this week’s episode, called ”Changing Channels,” managed to beat a few of those competitors at their own game. We were told Sam and Dean are dealing with a familiar foe: the Trickster, who plunks them down in a variety of TV genres. The Grey’s Anatomy spoof struck just the right tone of nighttime-soap mingled with Sam’s utter disbelief… that Dean knows so much about this Dr. Sexy, M.D. show. — Ken Tucker