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 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)
Visible crew/equipment: After the scene where Selina shocks the clown henchman with the taser, it cuts to the Mayor thanking Batman. As they walk down off of the walkway and continue down the road, if you look on the floor behind Batman you can see black camera tracks on the floor of the raised, bridge walkway. (00:16:15)
Visible crew/equipment: After Selina tasers the henchman, it cuts to the Mayor thanking Batman. As the camera pans past Batman, a noticeable shadow is cast on him. (00:16:15)
Continuity mistake: When the Penguin is first talking to Max, about him helping him emerge from the sewers, he spits as he speaks, and black spit covers his chin. The spit disappears when he begins to show Max the toxic waste, then reappears and vanishes again. (00:20:00)
Continuity mistake: The yellow bottles of fish food jump from the radio to the fridge, from when Selina arrives home the first time, goes off back to work, then returns back home the second time. (00:22:30 - 00:28:50)
Continuity mistake: Selina dumps her coat, scarf and bag on the sofa seat when she gets home. In another shot the coat and scarf have changed position, and the bag is gone. (00:22:30)
Continuity mistake: The position of the cards and notices stuck on Seleia's fridge change, from when she gets the milk out of the fridge when she's normal, to when she goes back to the fridge later, after being pushed from the window. (00:22:30 - 00:28:55)
Audio problem: When Selina returns home from work the first time and Miss Kitty comes in through the window, Selina pours some milk into the cat bowl and Miss Kitty begins to lap the milk (out of shot). Then, without a break in the lapping, Miss Kitty meows again as a cue for one of Selina's lines, but the lapping sounds continue underneath the meow. It's an open-mouth meow, too, and, as far as I know, no cat can both meow and drink at the same time. (00:22:45)
Continuity mistake: When Selina arrives home from work, she walks around and listens to her answering machine. She then has to run off to work. When she gets back from work a second time, the dishes and cups in the draining tray beside her sink have totally changed. (00:22:45 - 00:28:45)
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 is listening to her answering machine in her apartment, the items on the pull-out drawer, under the shelf with the fishbowl on it, change and move around between shots. (00:22:55)
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)
Continuity mistake: When Selina's looking at the files, the filing cabinets behind her have a wide gap between them. In the next shot they're pushed right next to each other. The items on top (medals, ornaments, etc.) also change. (00:25:00)
Audio problem: When Selina is pushed from to window, her scream doesn't match her mouth movement. (00:27:05)
Continuity mistake: Just after Selina has hit the ground, we see a shot from above, with her lying seemingly dead in the snow. In the next shot the pattern of the snow around her is completely different. (00:27:15)
Continuity mistake: When the cats are bringing Selina back to life in the alley, the paw prints they make in the snow around her body are subsequently there / gone. It is not snowing, so fresh snow could not make them vanish. (00:27:35)
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: The kettles on the oven hobs in Selina's apartment change their position and they change which hob they are on as well between the shots of Selina entering her apartment, and her grabbing the frying pan. (00:28:40)
Continuity mistake: When Selina returns home from work a second time she takes milk out of the fridge and pours her cat some. She then starts to drink some, spilling it all down her neck and blouse. When it cuts though her neck and blouse are suddenly cleaned up. (00:29:00)
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.