In the credits of every episode, Sarah Michelle Gellar and Mila Kunis have a special spoof credit, and in most seasons, there is a different person from the staff given a spoof credit right after them.
Hey, champ... pack your bags! We're going on a little trip! To DISNEYLAND!
son: Is Mom coming?
The fourth season's first ten episode titles forms the message: "Help me. I'm trapped in a DVD factory. They took my thumbs. Two weeks without food. Tell my mom I love her, but not in that way. Love, Maurice. PS: Yes, in that way."
The fourth season's last ten episode titles forms the factory's response: "Dear Consumer, we are a humble factory. Maurice was caught unionizing our labor. President Hu forbids it! Due to constraints of time and budget, the ramblings of Maurice cannot be erased, so sorry. Please do not notify our contractors. Especially the animal Keith Crofford!"
(The titles are scrambled due to release date/production schedules)
The Archie sketch in "Veggies for Sloth" was removed for the DVD release.