Tropes:
- Been There, Shaped History: Cavendish and Dakota's actions in this episode inadvertently create the leap year.
- Cowardly Lion: Averted with Zack. For someone that is afraid of fish and is claustro-avoidant, it's surprising to hear that he no longer gets scared so easily on Halloween anymore... until Zack discovers the Scream-a-Torium is dangling on a cliff.
- Fish out of Temporal Water: Cavendish and Dakota are from a future where there is no Halloween, so they are not familiar with the holiday and needed it explained to them.
- I Am Not Weasel: Elliot is dressed up as an Allosaurus, which Milo and Zack mistake for a Tyrannosaurus rex and Velociraptor respectively.
- I'm Standing Right Here: After he and Dakota create the leap year in Ancient Rome, Cavendish exclaims "Great Caesar's ghost!"...while standing next to Caesar in person.Julius Caesar: Great Caesar's what?
Cavendish: Oh, nothing. Nothing. We're just leaving. - Overly Long Gag: The truck drives into a lot of warehouses after it has rolled away, including an empty warehouse.
- Shout-Out:
- During Dakota's song, the time traveling duo are dressed up as Phineas and Ferb for a brief moment. Earlier, they encounter a kid dressed like Perry the Platypus as well.
- "You can be a ghost, and I can be a Fronkensteen!"
- Side Bet: Subverted. Zack tries to start one, but Melissa cuts him off, saying it's not gonna happen this time.
- Sticky Fingers: As usual, Dakota can't keep his hands off of Brick and Savannah's belongings.
