This episode reveals that Spider-Pig has been living in the Simpsons' yard ever since the events of The Simpsons Movie (2007).
When Homer discards some of his old items, the Mr. Plow jacket is included. Barney reaches in the garage for that jacket, stating that he finally gets to be Mr. Plow. This is reference to the ninth episode of Season Four, aptly titled "Mr. Plow", where Homer and Barney became snow plowing business competitors.
WILHELM SCREAM: Heard during Mr. Burns's football flashback.
The title is a reference to "Pork and Beans".