- For the titular character, see Mxyzptlk.
- "Kara, sweetest, like I said, I'm your one true love, your soulmate, your one true pairing, as the kids say. My name is Mxyzptlk and I love you, Kara Zor-El. [Kara: Uhh..] Tell me, will you marry me?"
- —Mxyzptlk proposes to Kara Danvers
When Mr. Mxyzptlk, a magical imp, shows up on Earth and declares his love for Kara, she tries to let him down easy, thinking him harmless. However, he decides it's a challenge and starts to wreak havoc on National City. Mon-El has seen beings like Mr. Mxyzptlk on Daxam and knows how dangerous they can be. He and Kara argue over how to get rid of Mr. Mxyzptlk, further straining their relationship. Meanwhile, Alex and Maggie celebrate their first Valentine's Day together.
- This episode is a loose adaptation of Supergirl and Mr. Mxyzptlk's first meeting in Action Comics #291: The Bride of Mr. Mxyzptlk! (August, 1962). In that story, Mr. Mxyzptlk tried to coerce Supergirl into marrying him using his magic.
- Mxyzptlk tries to serenade Kara by briefly singing "A Whole New World" from Disney's Aladdin.
- Mxyzptlk's attempt at shooting the armed robbers with their own guns is a direct reference to a scene in the first entry in the X-Men film series, further driven home by Mxy saying he "saw this in a movie once".
- Mxyzptlk's idea of a duel in the theatre is a direct reference to the duel between famous Americans Alexander Hamilition and Aaron Burr, furthermore the musical Hamilton, in which Hamilton and Burr duel with pistols, the latter taking the former's life (a fact referenced by Mxy referring to Mon-El as Hamilton).
- Additionally, Mxyzptlk suggests that Mon-El not "throw away [his] shot", referencing the third song of Hamilton, "My Shot".
- After Mxyzptlk grabs the pendant from Mon-El, he exclaims "Strike that. Reverse it.", quoting Willy Wonka from the 1971 film Willy Wonka & the Chocolate Factory.
- Supergirl's line "You wanna get nuts? Let's get nuts!" is taken from the 1989 Batman film.
- Mxyzptlk calling Kara a "nasty woman" is possibly a reference to the Presidential debate between Hillary Clinton and Donald Trump that took place on October 19, 2016, during which Trump called Clinton a "nasty woman".
- When Mr. Mxyzptlk is dressed as Superman, he lands in front of Smallville’s Daily Planet building.
- Mxyzptlk calling Mon-El "McGurk-El" seems to be a callback to Superman: The Animated Series where in his debut episode, Mxy was shouting the name "McGurk" during several of his entrances.
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