Bart decides to get rid of Santa's Little Helper after he eats the bird that Bart was trying to save from dying.
- Fun with Acronyms: Milhouse uses the pigeon to send Bart a message with a PDF file. The "file" is a photograph Milhouse considers Pretty Darn Funny.
- Missing Mom: Nelson's mother eloped with the clown from his birthday party.
- Mouse Hole: In the intro, when the Simpsons entered their living room, Prof. Frink shrunk them and they ran into the hole to escape the cat.