Creed from The Office does a Princess Bride grandfather/grandson thing. “A book is kind of a boring version of video games” he explains to the boy by way of introducing Season 4 (it makes more sense in the trailer).
In the clips we get glimpses of Badger from Breaking Bad, one of the nerds from Big Bang Theory, Maya Rudolph, Jack McBrayer from 30 Rock, Henry “The Fonz” Winkler, Mark Duplass, some shadowy guy in a helmet that sounds like Hugo Weaving, another dude from The Office, David Alan Grier, Phil and Mitch from Modern Family, sword fighting, Wolverine claws, Freddy Kreuger, Jim Rash looking like Professor X and oh oh oh, so much more.