Seen in Comicalooza; Matt Groening's early Life in Hell characters, A Futurama banner, Kang and Kodos costumes, and a Star Wars Tauntaun based on Homer, and Matt Groening.
Comicalooza has a vendor called Aunt May's Pretzel's. This is a take-off on the Auntie Anne's Pretzels chain, using Aunt May, a character from the Spider-Man comics.
Couch Gag: The Simpsons approach the coach and there is Thanksgiving dinner spread out on the floor. The couch says, "You'd be home by 7. Go sleep on the bed" and blows out the candles.