From such a pop-culture obsessed site I would expect that there would be some mention of the constant protestations of "I am NOTHING like Ralph Macchio" as an meta-joke coming from fellow 80s child star Neil Patrick Harris.  Funniest gag of the episode.

Did anyone else notice the "Rent Memento" note on Chang's arm?  That little throwaway gag got the biggest laugh of the episode from me.