Matthew Gilbert’s notes on the best Friday night TV offerings, including “Portlandia: The Brunch Special” at 11 p.m. on IFC; “40 Funniest Fails” at 9 and 10 p.m. on VH1; “King of Dirt” at 9 p.m. on DIY; “My Babysitter’s a Vampire” at 8:30 p.m on Disney; and “Say Yes to the Dress” at 9 and 9:30 on TLC.
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