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)
Continuity mistake: In Schreck's department store, when Catwoman is doing her cartwheels, her heels collapse. (00:53:40)
Continuity mistake: When the Penguin is looking out of the barred sewer hole, from an inside shot we see the penguin holding two bars, and in between the bars he is holding are two bars. In the next shot, there are four bars in between. (00:06:05)
Continuity mistake: Catwoman's lipstick smears down onto her chin when she puts The Penguin's bird in her mouth, yet in the shot just before she gives herself a "bath", the lipstick momentarily is gone. (01:03:20)
Continuity mistake: In Batman's first battle with the Red Triangle Circus gang he manages to escape from a fire eater by turning his batmobile around and burning the guy with the rear exhaust jet. He does this by flicking a switch (outlined in caution symbols) next to the steering wheel. When the Penguin takes Batman for a ride there is a television screen where the switch is supposed to be. When Batman blows the Batmobile apart to get through a narrow alley the switch is back in place. Not only that but the switch seems to control just about every major system on the car including the lights, shield cover, gun turrets (in the first movie), canopy etc.
Continuity mistake: When Selina returns home from work she takes milk out of the fridge and pours her cat some, leaving the carton on the worktop. She then runs to work, and when she returns after being changed to 'catwoman', the milk has vanished from the worktop. The dishes also move and plant pots appear on the window sill. (00:22:50 - 00:28:45)
Continuity mistake: When Selina retrieves her papers from the floor, she places them in a disorderly pile beside the clown. In the shot when she zaps the clown with the taser, the papers have changed position and are stacked neatly. (00:15:55)
Continuity mistake: When Selina puts her soft toys into the sink, and begins to push them down into the shredder hole, between shots the positions of the teddies in the sink differ. (00:29:45)
Continuity mistake: When the Penguin bites the guy on the nose, while he is talking to Max Shreck afterward the blood on his face is there, then it disappears, then it's there again. (00:49:40)
Continuity mistake: The rubble and debris from the piece of wall which Batman tore from the wall, which lies beside the clown, differs between shots, and so does the clowns position. (00:15:50)
Continuity mistake: When Selina becomes enraged and trashes her apartment, she grabs a frying pan off of the oven hob, which was not there previously, when she entered her apartment. (00:28:40)
Continuity mistake: After Selina pours Max Schrek his coffee in the first boardroom meeting, she walks around his chair twice. (00:07:30)
Continuity mistake: When Batman fights Catwoman, he hits her to the floor, and the thick handled end of her whip dangles down and touches the ground. In the next shot it is wrapped and tucked in a circle around her chest. (00:57:25)
Continuity mistake: When the Penguin picks up the ointment bottles, he throws them up and they land on the bed and pillows. These bottles and Catwoman's whip, which lays on the center of the bed, keep changing position. (01:02:00)
Continuity mistake: When Catwoman saves the woman from the alleyman, she has high heels on, but after she says "I am Catwoman. Hear me roar." she starts doing backflips, and clearly has flat black shoes on. (00:41:45)
Continuity mistake: When the Penguin is talking to his penguin audience about stealing first, second, third and fourth born children, the penguins chair, box and umbrella stand in the background keep changing position. (01:38:25)
Continuity mistake: Selina grabs some stuffed animals and throws them in the sink, where she starts jamming a monkey down the garborator. We cut to her face, and when we cut back to the sink, all the other stuffed animals are gone, but we know she hasn't had a chance to shred them because she is still shredding the last of the monkey.
Continuity mistake: When Selina is creating her Catwoman suit, the items she tips out from her sewing kit box change formation and position. (00:32:25)
Continuity mistake: Max's big outer coat and his patterned scarf suddenly disappear between shots, when he leads the Penguin over to his image consultants. (00:48:45)
Continuity mistake: When Max is walking up to Selina from behind, we see her flipping through files, and she puts the paper back down into the drawer. In the very next closeup she's suddenly looking at another file. (00:24:25)
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.