"Hungarian Rhapsody" is a famous piano song by Franz Liszt, which Bart pointed out was used in the Bugs Bunny short "Rhapsody Rabbit."
The quotes where Dan says to just other parts of the horses body in people's beds and not just the head, is a reference to the horse head scene in "The Godfather."
The music playing during Fit-Fat Tony's giving of the verdict was J.S. Bach's Passacaglia in C Minor.
The Magnificent Seven theme plays in Lisa's dream while she is riding a cricket.
In the title screen gag, Homer is in a poncho, this is a reference to a Simpsons episode, "King-Size Homer."
In The Simpsons: Tapped Out before this episode players could unlock Fit-Fat Tony for a limited time.
When the camera cuts to the Simpson’s house, the screen is off-centered.
Marge with white pearls
On the Tattoo Couch Gag, Marge’s pearls are white rather than red.
In one frame when Dan is explaining to Homer at the Power Plant's parking lot about how he has to kill a bunch of people, his middle finger is not outlined, making it appear non-existent.
The revelation that Lunchlady Doris is a vegetarian comes completely out of nowhere, being a character who not only regularly prepares and serves all types of animal products (including using bull testicles for iron, baboon hearts, circus monkeys found in Grade F meat, and human flesh [though that was from a Treehouse of Horror episode and considered non-canon]), but, on "Lisa the Vegetarian", she offered no support or even acknowledgement when Lisa requests a non-meat lunchroom option. While it is possible she became a vegetarian after all this and doesn't (or can't by union law) express her personal diet on the school menu, it seems odd that Lisa doesn't really question this reveal at all.
Continuity[]
Lisa said that she promised Paul McCartney to not eat meat. This references "Lisa the Vegetarian," in which McCartney only agreed to guest star in if only Lisa stayed a vegetarian for the rest of the show's run.
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