Continuity mistake: When Mr. Freeze crashes the costume ball, and shortly after he yells "Get the gun", Batman totally missed his first kick against the skating goon. It's painfully obvious even without slow motion. (00:44:10)
Continuity mistake: In one of the scenes when Freeze is going to take the diamonds from Ivy's neck, you can clearly see that he has no make-up in his neck (and it isn´t an effect of the lights, he has really no make-up). (00:45:00)
Revealing mistake: When Mr. Freeze knocks out the two guards after being released from the fridge, one of the guards falls against the fridge causing it to wobble. A big heavy fridge like that should not wobble. (00:55:30)
Revealing mistake: When Poison Ivy and Bane take over the street gang's lair, they try to take down Bane by wrapping chains around his arms. As he throws them over his head, one of the thugs still attached to their chain causes Bane to move backwards slightly. Kind of unlikely considering how strong Bane is. (00:57:40)
Continuity mistake: When Poison Ivy first enters the Turkish Bath she is wearing a green top, tights and boots but as she is redecorating just after ejecting the gang members she now has brown tights and high heels. (00:59:10)
Revealing mistake: When the police attempt to arrest Mr. Freeze, he makes his escape with his freezing equipment on a cart. As he pushes the cart, the frozen icicles on it move as though they are made of plastic. (01:17:55)
Other mistake: When Mr. Freeze threatens to freeze all of Gotham City, he has a big snowglobe in his hand. He freezes the snowglobe, then shatters it in is hand. When he crushes it open with his hand, the inside of the snowglobe is empty. There is no water, frozen or unfrozen, that comes out of the snowglobe when it breaks. (01:23:50)
Continuity mistake: When Ivy blows her pheromone dust at the cop, her right hand is either holding the powder container or not, depending on the shot. (01:27:11)
Revealing mistake: When Robin is being pulled underwater by Ivy's plants he surfaces for air and gets pulled under again. It's obvious the film was just rewound. Then when he finaly gets free we see the shot that was rewound was the same shot used when he escapes. Really bad editing. (01:34:50 - 01:36:40)
Continuity mistake: When Robin steps foot into Poison Ivy's lair she is laid out on her flower bed. If you look at the sleeves of her costume, the ends of the sleeves are fringed in a simple leaf like design. Robin spurns Poison Ivy's affections, and an enfuriated Ivy pushes him into the lily pad pool. She is then confronted by Batman, and a soon to arrive Batgirl. Now - look at the huge, obvious, black rubber "thorn" bracelets that suddenly appear on each of her wrists. (01:37:25)
Audio problem: Ivy tells Robin that Freeze wants to turn Gotham into "an ice cube" but she's not mouthing those words. (01:38:14)
Revealing mistake: When Freeze is freezing the town, the cop car that crashed into the store has flexible icicles on the driver side door. Also when the city is being defrosted, when the cop comes out of the car, the icicles are very wobbly. (01:38:15 - 01:48:15)
Revealing mistake: When Gotham City is frozen by Mr. Freeze, there is a shot of a telephone box. The icicles on the telephone box wobble as though they are made of plastic. (01:42:15)
Visible crew/equipment: Just after Robin and Batgirl have dropped down to a ledge beneath the Gotham Observatory in the final fight scene, Bane appears behind them and grabs them by their necks. You can see the light reflected from the camera crews' lights on the icy wall on the right side. (01:43:05)
Revealing mistake: When Batman places the heaters around the telescope to thaw the ice, the frozen floor moves like plastic when he places the second heater. (01:45:00)
Other mistake: While fighting Mr. Freeze (and Bane) at the Gotham Observatory, Batman, Robin & Batgirl all have batsuits on, with silver bat (or robin) symbols on their chest. But while they are giving Alfred the cure to Stage 1 of McGregor's Syndrome, for some reason they have changed clothes before giving him the cure. Because now (other than the fact that they have all taken off their masks) Robin has on his original robin suit (with the red robin symbol across his chest) and Batgirl has on a gray t-shirt. (01:55:25 - 01:56:15)
Other mistake: During the end credits when the listing for the vehicles go by, it shows "BATMOBILE, FREEZEMOBILE REDBIRD, BATHAMMER, BATSKIFF, and BATCYCLE BY TFX." There should be a comma between Freezemobile and Redbird. (02:02:05)
Continuity mistake: When Poison Ivy is talking to herself when she is leaving the observatory, you can notice that the policemen she pushed away have vanished in the background.
Other mistake: Apparently, guessing Alfred's password also turns computer monitors into projectors. Before Barbara guesses the password, none of the light/information on the monitor reflects off her, but afterwards, she might as well be a projector screen.
Answer: Maybe she drained the cryo-tube first? Maybe she did get wet but had dried off by the time we see her again? Maybe Bane did it for her? Pick whatever answer works best for you. It's a really small, insignificant detail in the film with plenty of potential answers.
TedStixon
Thanks though keep in mind she wouldn't have a clue as to how it works since she's a botanist not a scientist in cyro genetics.
Rob245
She pulled the plug on the thing so Nora died and the tank drained (either automatically or Ivy did it). She just took the necklace off the body.
lionhead