In the music store when Frank is banging on the drums you can see in the left corner standing behind Frank a man holding a camera recorder.
(This may be a deliberate, as it might of been part of the scene as a customer in the store recording Frank's antics.) See more » Seeing Danny Devito trying not to break while Charlie sings Nightman is worth the price of admission, whether that admission price be DVD, Cable, electric bill, internet bill, etc.
A commenter pointed out last week that the cut between the opening scene and the title card is often the funniest moment of any episode.
While Dennis and Dee try to figure out if the rapper Dee is dating has a mental handicap or not, Charlie, Mac, and Frank try to start their own band without knowledge of how to play musical instruments.
This episode is one of the quintessential episodes of Always Sunny.