All of the above? I swear to God that Brad's done this one before. Maybe Paul did this without either consulting Brad or by, say, looking at old ones to see if it has been done. Wait, maybe they did this one in Dennis The Menace or perhaps Family Circus. I dunno.
All I know is that I like the use of the flat-screen TV. It shows us that Brad is still "hip" and "relevant" even if his cartoon is "insipid".