When the A.S.S. legions show up at the Simpsons, Bart asks Lisa "Who knew a bunch of guys in brown shirts could cause so much trouble?" This is a reference to the Brown Shirts of the Sturmabteilung (SA) who were the most violent members of the German National Socialist (Nazi) Party before they took over Germany in 1933.
When Abe gets the kitchen appliances confused, he mistakes the microwave for a TV, and puts in a VHS of Sands of Iwo Jima. Abe sets it to run for two hours, but the movie is only 100 minutes long. This was just done as it is easier for a joke.
The montage song is "is she really going out with him?" by Joe Jackson.
When Homer and Patty prepare their mental images so they can kiss each other without barfing, Homer imagines Patty as Marge, Marge as a cowgirl, Marge as a cheerleader, Marge as a devil and Marge as a hot dog chef. Patty imagines Homer as Edna Krabappel, which means that Patty has a crush on Edna.
In spite of his financial state, it’s quite surprising that Homer agreed to have Abe move in with the family given the fact he was the one who sent Abe to the Retirement Home in the first place and has also tried to avoid contact with him on several occasions since.
When Abe says he doesn't even have two kidneys to rub together it's true since Homer "donated" one of his kidneys to him after causing Grampas kidneys to explode by not stopping to let him go to the bathroom during Homer Simpson in: "Kidney Trouble"
This is the second episode where a Simpson falls down the steps to the basement because they couldn't see where they were going. The first was "Bart the Mother".
This is one of the few episode after season 10 (Phil Hartman's death) that makes reference to Characters Troy McClure and Lionel Hutz.
This is the second time that Abe has eyes on a relative of Marge. The first time was when he was courting Marge's mother. Although it wasn't mentioned, it's assumed that Homer wasn't happy with the pairing of Abe and Selma because that would mean he would be Marge's nephew (and he doesn't like the idea of being Selma's son, as he hates her).
Homer tells Lisa that birds swelling up after eating rice is an urban legend. In typical Homer fashion, he is quickly shown otherwise, but in real life, he is correct: raw rice is not harmful to birds, and it certainly does not cause them to explode.