- Call-Back: In The Last Temptation of Homer, Mr. Burns tried to deploy a team of winged monkeys but they couldn't fly and he told Smithers to continue the research. It now seems to have paid off.
- Charlie Brown Baldness: Lampshaded when the Simpson kids freak out over how there's no border between their hair and their heads.
- Coincidental Accidental Disguise: As Marge goes to find Homer, a series of mishaps gradually make her look like the Wicked Witch of the West.
- Crazy Cat Lady: The Trope Namer discovers her Spear Counterpart in a Crazy Dog Man.
- Same Surname Means Related: Lisa picks up a supermarket tabloid to read about "Cousin Jessica."
- Series Continuity Error: Marge is shocked that she's had gray hair for all these years, when the season five finale "Secrets to a Successful Marriage" revealed that Marge has been "...gray as a mule" since she was 17 and regularly dyes her hair herself. Though another question remains: Marge was seen with blue hair when Homer first met her in "The Way We Was" when both of them were high school seniors (or, at least, Marge was. It's implied that Homer is older than her, though he could have been left back due to bad grades). Did she dye her hair then or was this before she started going gray?
- Shout-Out: When a series of accidents made Marge look like a wicked witch from The Wizard of Oz, a flying monkey was briefly seen at the background.