Since we're on the subject of obscure characters, I figured I'd bring this up again:
This picture. It's intrigued me ever since I saw it in the "Game Day" promo. There's just so much going on here, it's pretty overwhelming.
Anyway, at the back of the picture, you can see several Muppets plastered to a wall. Among these Muppets are Foo-Foo, the EM, Crazy Harry, and a Muppet that looks like none other than (get this)
Brewster. Right above Tina Fey's head, there's a Muppet that is dressed in yellow-ish brown clothing and has a big, white beard, much like Brewster.
A few have speculated that it's just a Muppet prisoner and not Brewster, due to the fact that he's wearing the same outfit as the rest of the prisoners, but why would they just throw a random prisoner up there with the rest of the main Muppets?
What do you guys think? I really think (and hope) that it's Brewster.