Directed by: Tim Burton
Starring: Christopher Walken, Michelle Pfeiffer, Danny DeVito, Michael Keaton, Michael Gough
Character mistake: Penguin shouts, "I am not a human being! I am an animal! Cold-blooded!" Penguins are actually warm-blooded.
Character mistake: Bruce Wayne talking to Selina Kyle says that Batman probably saved millions of dollars in property damage alone. When Batman first saw Catwoman he didn't do anything to prevent the property damage before the explosion that she caused.
Visible crew/equipment: After Batman and Catwoman's mistletoe banter, a wire can be seen attached to his back as he glides off the rooftop. (01:20:15)
Trivia: Annette Bening was cast as Catwoman but after becoming pregnant was replaced by Michelle Pfeiffer.
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Answer: Nothing was stopping them. After Penguin's true nature was revealed, they most likely started searching the entire sewer system but couldn't find where his lair actually was so they had no choice but to give up.