The graffiti Kenneth is cleaning off the wall in Brian Williams' dressing room reads "Katie Couric sucks."
The tune The Head is playing on his recorder is Don McLean' 'American Pie '.
The game-show host is played by the famous tennis pro John McEnroe and is credited as portraying himself. He is well known for yelling annoyed things on camera during tennis matches, so the joke is that he's yelling similar things near the end of the show.
Frank's trucker hat reads "Smells."