Mr. Burns builds a doomsday ark, after he believes that the end of the world is near when he sees an old Orson Welles show about Nostradamus. Professor Frink comes up with a new way of testing everyone in Springfield after Burns wants a test to determine who should go on a spaceship with him.
- Construction Zone Calamity: Lisa follows Ralph Wiggum as he wanders into a construction site. Chief Wiggum points out the use of this trope on cartoons.
- For Inconvenience, Press "1": When Lisa phones Chief Wiggum, she hears a recorded message telling her to press one if Ralph is stuck on something; two if something is stuck on Ralph; and, if the caller is Ralph, he's not inside the phone and Ralph is not supposed to open the phone to look for him.
- Ivy League for Everyone: Prof. Frink attended Cornell.
- Laser-Guided Karma: Once Burns makes it clear everyone aboard the ark would be enslaved, he's abandoned by everyone. And taking off without Smithers leaves him completely defenseless against his malfunctioning robotic aides.
- Left the Background Music On: The background music that starts playing when Homer starts improving his calligraphy comes from Lisa's radio.
- Running Gag: Homer has several moments where he's an example of Book Dumb.
- Shout-Out: One of the series introduced in Orson Welles' show is The Nukes of Hazzard.
- Take That!:
- When Prof. Frink gives Lisa ten extra points if she doesn't tell anyone his test is flawed, he says it's for accepting a similar deal he was accepted at Cornell University, which he considers the worst of all Ivy League universities.
- When Homer asks Marge what a man can do after turning 39, Marge informs him that George W. Bush went sober and ran for President. Homer replies that both were the biggest mistakes George W. Bush ever made.
- Talent Double: In-Universe during Frink's presentation. The transition from Frink to his dancing double is less than seamless; not only is the double taller and more muscular than Frink, you can also see Frink crouching behind a column after the switch. You can also see the double crouching behind a couch after they switch back.
- Turned Against Their Masters: Mr. Burns is being strangled by his own robot.
- Who Would Be Stupid Enough?: Lisa asks who would take Orson Welles' show seriously, the scene cuts to Mr. Burns being worried about the end of the world.