Found this...
Just a handful of the famous folks who make cameos: Rashida Jones, Jason Schwartzman, Rainn Wilson, Steve Buscemi, Ted Danson, Chloe Sevigny, Kirsten Dunst, Maya Rudolph, Orlando Bloom, David Cross, Jack Black and John C. Reilly. Meanwhile, Will Arnett revisits his portrayal of Gob Bluth from "Arrested Development" with a hearty "Come on!" and Will Ferrell plays multiple characters, including one that's -- but of course -- cowbell-loving. There's even a vintage DeLorean!