Chalkboard: I will not torment the emotionally frail

Couch Gag: The family all cartwheel and make a "ta-da" pose once on the couch.

Lisa: It's not our fault our generation has short attention spans, Dad, we watch an appalling amount of TV.
Homer: Don't you ever, ever talk that way about television!

(Homer and Marge are in the castle at the miniature golf course)
Homer: Someday I'll buy you a real castle.
Marge: Oh, you don't have to do that.
Homer: Whoo, good.

Marge: Well, I guess I better go see Dr. Hibbert.
Homer: Oh honey, do you really think you're pregnant?
Marge: Well, I've had the same nausea and craving for pancake mix I did with the other kids.
Homer: Yeah, and I have the same tightness in my chest and the sweating I always get.

(Homer and Marge get married at Shotgun Pete's)
Minister: Then, by the power vested in my by the state gaming commission, I pronounce you man and wife. Here's ten dollars worth of chips. You may kiss the bride. Next!

When Homer is writing his goodbye-letter to Marge he completely scratches out Patty's name on the paper. In the next scene it has only one line through it.

Mr. Burns doesn't look any younger in 1980 compared to what he looks like today.

Shotgun Wedding

Homer and Marge get married at Shotgun Pete's, which references the term for a type of wedding which is arranged not because of the desire of the participants, but to avoid embarrassment due to an unintentional pregnancy. The phrase is an American colloquialism based on a supposed scenario that the father of the pregnant daughter, almost by accepted custom, must resort to using coercive force (the shotgun) to ensure the marriage is carried out.

Star Wars: The Empire Strikes Back

Homer says, "Who would have guessed that Darth Vader was Luke Skywalker's father?" This is a reference to the famous movie of 1980.