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.







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