This is awesome. I thought I knew them all, but I realised a few mistakes on second glance… spoilers below

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Dwight from the Office (US)
Vampire dude from True Blood (Bill?)
Buffy (I originally mistook for Sookie)
Jeff Winger
Blonde bitch from Glee (originally wondered why Britta was in a cheerleader outfit)
Sheldon from Big Bang Theory
Spock
Chuck
Barney Stinson
Dexter
Sherlock
Dr Who
Is that Walter from Breaking Bad?
Rick Grimes - Walking dead
Jack Shepard - Lost
River from Firefly?
Think the blue man is David Cross, was that Arrested Development?
Tina Fey - I assume it’s her character from 30 Rock
JD - Scrubs
Dr Gregory House

So that leaves me with the blonde on Dwight, the Dude smoking on the couch, the Pink haired girl, and dogs/cat

Any TV geeks out there?