- Alas, Poor Villain: Batman could only feel sorry for Riddler and even expressing disgust against his former lover for turning him into this.
- Berserk Button: Whatever you do, don't call Edward Nygma "Champ", or use the phrase "Play Ball". Gorman learned first-hand how badly those words trigger him.
- Bitch in Sheep's Clothing: Julie may seem sweet and romantic and understanding, from Riddler's point of view. But in reality, she turns out to be conniving, greedy and cold-hearted.
- Bittersweet Ending: Riddler's been thwarted and there's a possibility Julie will go to prison for criminal negligence (her sabotaging the memory device that fried the professor's brain). But nonetheless, Batman can only pity Riddler, who is not only defeated but severely heart-broken by Julie's betrayal.
- Foreshadowing: Batman wondering if Riddler is sure it was Gorman tells us that it had to be someone else who sabotaged Nygma's invention.
- Forgotten First Meeting: Not by Eddie, though Bruce did forget, as this episode retconned that "Riddled" was not their first encounter, but Bruce first meet Eddie when Eddie first went after Gorman with that meeting inspiring Eddie to becoming the Riddler.
- Freudian Excuse: As a bright child, Riddler grew up with a bully-of-a-father who would throw baseballs at the boy's puzzles, making him resent people with no appreciation for mind puzzles (and ball games, for that matter).
- Karmic Death: Julie nearly bites the big one when Riddler tries to weaponize his invention on her, but it's averted when Batman intervenes.
- Meaningful Echo: In the flashback, Batman notes that the most obvious answers aren't always the right ones in riddles. Later, when Riddler points out how 'obvious' it was that Gorman sabotaged his invention, Batman remarks more or less what he said in the flashback.
- Ship Sinking: So much for Julie and Nygma being a couple.
- Start of Darkness: According to Riddler, Gorman's (alleged) sabotage of Nygma's invention was the tipping point that lead to his life of crime.
Recap / The Batman S 4 E 9 Riddlers Revenge