Things seen in the vent: a rat, a coin, the books How To Get Your Baby Off Her Pacifier and How To Clean Your Vents, the family from The Borrowers, and a paper with "Bitcoin passwords do not lose" written on it.
This is the series' 700th episode.
The booth Homer sits in at Moe's Tavern is the Dr. Marvin Monroe Memorial Booth.
Despite being Christmas themed the episode actually aired in March marking a rare instance of a Christmas episode not airing in December.
Names of Burns' hounds: Slasher, Gasher, Mangey, Nips 'Em, Stalker, Vicious, Rabid, and Rips 'Em.