There was a lot of Bat-tech, but the "camera" contact lenses stood out to me. The scene where Catwoman infiltrates the 44 Below club was fun and tense because of them.
Catwoman in general was great, and I'm bummed she disappeared for a good chunk of the 2nd act.
Despite juggling four notable Batman antagonists (Catwoman, Penguin, Falcone, Riddler), the movie never felt like a juggling act.