Continuity mistake: Just before Batman takes his mask off at the end, the black makeup around his eyes vanishes while the mask is still on. (01:48:20)
Batman Returns (1992)
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Directed by: Tim Burton
Starring: Christopher Walken, Michelle Pfeiffer, Danny DeVito, Michael Keaton, Michael Gough
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Trivia: Annette Bening was cast as Catwoman but after becoming pregnant was replaced by Michelle Pfeiffer.
Question: Why is Penguin's blood green?
Chosen answer: It is part of the mutation that caused his peculiar appearance.
Answer: It isn't. If you look at when he dies you will see that he has cuts on his face that are bleeding red. The blue liquid is more like a bile, probably similar to saliva.
What about when he emerges from the water and green blood comes out of his nose and then his mouth?
As the answer says, it's most likely bile or some other bodily fluid, not blood that we see flowing from his nose and mouth.
TedStixon