Plot hole: Several: 1. How did Hush get Batman's fingerprints on the knife? 2. How can the likes of Mad Hatter, Zsasz, and Deadshot go through the prison city without being spotted? 3. Why wouldn't Batman suspect Ra's al Ghul of being the power behind Strange once he discovered him in the prison city?
Professor Hugo Strange: I feel I should thank you, capturing Bruce Wayne is so much easier than Batman.
Trivia: At the theater Clayface is watching "The Terror" a movie starring Jack Nicholson, who played the Joker in 1989's Batman.
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Suggested correction: More likely, this is a reference to Clayface's origin in the comics, where he was an actor who starred in a film called "The Terror," then dressed as its killer and killed the cast and crew of a remake set to be made without his involvement (his shapeshifting powers coming later into his character's life). This is evidenced by how the film on the projection screen appears to be a black and white film from the 30s-40s, matching Clayface's first appearance in comics.
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