Four Great Women and a Manicure - S20-E20
Trivia: Bart neither appears nor is mentioned in this episode.
Trivia: During the couch gag, the Simpsons run through different places (as spoofs of different TV shows). One of the places they run through is the bar from Cheers. When they all sit down, Sideshow Bob walks through the door. Kelsey Grammer does the voice of Sideshow Bob, and starred as Doctor Frasier Crane in Cheers.
Continuity mistake: When Homer's Vegas wife shows him the video in front of Marge, it shows Homer kissing Ned. This didn't happen when she showed it in the Vegas episode.
Homer's brain: It's simple, just use reverse psychology.
Homer: Reverse psychology? That sounds too complicated.
Homer's brain: Alright, don't use reverse psychology.
Homer: Alright, I will!
Who Shot Mr. Burns? (2) - S7-E1
Question: Chief Wiggum says that Space Invaders was an addictive video game, and Groundskeeper Willie says, "Video game?" I don't understand why he is so shocked. Could someone help please?
Answer: The joke is that Willie was so addicted to Space Invaders that he believed it was reality: every time he played, he was actually defending the Earth from dangerous aliens. It's a surprise to him that it was actually a game.
Answer: Willy referred to an encounter he believed he had with actual aliens, while Wiggum thought he was referring to the arcade game.