It's a science fair, with a twist. Someone's using magic to curse the leaders in the science fair. And the Rule of Three is going to make sure whoever's doing it will pay in spades.
- Badass Boast: Amy's response to another student's claim that her experiment couldn't possibly electrocute all the students:Amy: I'm Amy Meyer. I've won every ribbon, every medal, every trophy you've wanted since we were five. Do you really think I'm bluffing?
- Dark Horse Victory: Leonard's volcano wins the fair.
- Education Mama: Amy's mother, who describes herself without shame as not just a tiger mom but "the wolverine of mothers," and is clearly more invested in Amy's success at the STEM fair than Amy herself. Amy and Cassandra bond over being denied normal teenage enjoyments and social lives for the sake of their parents' dreams; Cassandra's gave up after she got sick, and at the climax of the episode Amy bluntly informs her mother that it's her life and future.
- Goth Girls Know Magic: Subverted; when dark magic breaks out during a STEM fair, the initial suspects are a trio of goths who've been hanging around despite not having exhibits, but it later turns out that they're only there because one of their number has a crush on one of the competitors.
- Gratuitous Latin: Morgan's message for Jenkins is "Noli timere malum, sed time heroa." ("Do not fear the villain; fear the hero" in Latin.)
- Karma Houdini: Morgan Le Fay, who's responsible for everything, gets away scot-free.
- Post-Modern Magik: A spell in the form of an app.
- Precocious Crush: Eve tries to interrogate Leonard, and he responds to all her questions with things like, "When you say my name, it's like a thousand angels singing."
- Science Fair: The entire episode's setting, complete with a baking soda volcano.
- Title Drop: The Rule of Three is a magical concept that serves as a key plot point in the episode, and as such is referenced repeatedly in dialogue.
- Will Not Tell a Lie: Morgan, according to Jenkins.