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)
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)
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)
Continuity mistake: When Selina enters her apartment after going back to work, there is no wooden spoon in her sink draining rack, but one appears later when she puts the teddies in the sink. (00:29:00 - 00:29:50)
Continuity mistake: When Selina arrives back home after being pushed out the window, she presses her answering machine button and brings her arm to her side. In the next shot her hand is on the machine again. (00:29:05)
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 Selina puts her soft toys into the sink, she grabs a wooden spoon and begins to stab a pink teddy down into the shredder. But in a closeup she is now pushing a soft toy monkey into the shredder. (00:29:45)
Continuity mistake: When Selina puts the pink teddy down the shredder, it begins to spit and churn out stuffing and feathers. However in the next shot of Selina grabbing the frying pan, the shredding of the teddy has mysteriously stopped. (00:30:00)
Continuity mistake: When Selina is wrecking her apartment, she grabs a frying pan and throws it at a small display case, smashing all the glass and ornaments. Between shots the glass/ornaments on the case shelves differs. (00:30:10)
Continuity mistake: During shots, before the shot of the two cats coming through the window and onto the table, the items on the table (lamp, snowglobe, glowing santa, etc.) change positions. (00:30:15)
Answer: The film keeps it ambiguous. There are two ways to look at it. Scenario A- She literally died and is brought back to life by the alley-cats somehow, adapting some of their traits. Or... Scenario B- The trauma of falling and sustaining a head-injury, along with her paranoia after Schreck tried to kill her, has driven her mad, and she uses her connection with cats to build a new persona. (Which is supported by the fact that all the things she claims "kills" her with each of her "nine lives" wouldn't actually have killed her. Ex. Her one fall is broken by the kitty-litter truck. Max doesn't hit her in any vital organs when he shoots her. Etc.) Her destroying her apartment is her lashing out at all the things she used to hold dear- her vision of a normal life, etc. It's symbolic of her purging the past and embracing the future. (Plus, oftentimes when people throw fits, they'll smash stuff up).