Professor Frink turns into a handsome man in order to woo ladies.
- All Just a Dream: The couch gag. The couch leaves and the Simpsons go on a journey to find it. Homer is dreaming the whole thing while asleep on the couch.
- Expo Speak: The episode title contains the chemical symbols of the main components of air (nitrogen, oxygen, argon, carbon dioxide, neon, helium and methane). Hence, "Love is in the air".
- Hoist by His Own Petard: Mr. Burns is made to fall into his own pit.
- Idea Bulb: Professor Frink has one but he complains that it's not eco-friendly so it disappears and a modern version shows up.
- Imagine Spot: When Smithers suggests a sweetheart ball, Mr. Burns imagines a party where people give him literal hearts.
- Loving a Shadow: When Grampa starts hallucinating Mona is alive and young again, he pictures her as an ideal 50's style doting wife. He notes that she's nothing like how Mona really was, and she states that she is how he wants to remember Mona rather than how his wife really was.
- Obnoxious In-Laws: Professor Frink not only built a robot girlfriend but also built a mother for her.
- Skewed Priorities: When Mr. Burns is dropped on his own trap door, he's upset that the pit isn't bottomless as the maker said it was.
- Third-Person Person: Duffman says he'd love to speak in the first person.
- Weather Dissonance: Despite taking place around Valentine's Day in February, there are no signs of winter anywhere (no snow, no bare trees, no winter clothes, etc.) and appears to already be spring.