Everyone Has Standards: Homer finds the bartender quite judgmental for taking semi illegal bets when he shames him for taking a bet against his daughter.
Nom de Mom: When Homer bets against Lisa, it hurts her feelings to the point she decides to use her mother's maiden name out of hatred to him.
Throw the Dog a Bone: A very rare instance with Gil actually succeeding at something, at the cost of him looking like a Jerkass to a child like Lisa.
You're Not My Father: When Lisa found out that Homer betted against her, she disowns him. Unlike in "Lisa's Pony" and "The Dad Who Knew Too Little", where she was just angry but eventually forgives Homer, she takes her mother's surname to show that she officially hates him on par with her aunts.