You know, now I wonder how big Muppet fans the crew really is. I don't doubt they are big fans, but I now get the feeling they're not the kind of fans we are. They said they wouldn't compete against us in a quiz, made a mistake about the Rudolph Nureyev episode, seemed to think Behemoth is a new character (though later one of them does say that he's not new), and of course the fact that they didn't know until they had the Creature Shop involved with one of Jason Segel's movies that The Jim Henson Company didn't own the Muppets anymore.
It makes me wonder if they are really more fans who grew up with the Muppets and still like them heavily. It's been said that Jason Segel and Nick Stoller were more familiar with the movies than the show (so I'm guessing they didn't own copies of the seasons 1-3 DVDs until they pitched the script, if they even do have copies now). I wonder if they previously knew the names of any performer besides Jim Henson and Frank Oz, or if they could name who performed who.