Sally mentions the scene from the previous movie where she and Linus are sitting in the pumpkin patch waiting for the Great Pumpkin

Ted waiting up all night on Halloween for the Slutty Pumpkin to appear is reminiscent of Linus waiting for the Great Pumpkin in It's the Great Pumpkin, Charlie Brown. At the end, The Shagarats sing the Peanuts theme, "Linus and Lucy".