Selina steals a full jug of milk but when she feeds the stray cat it's only about one tenth full. However, that's because she drank most of it on the way there.
When Barbara Kean (Erin Richards) and Renee Montoya (Victoria Cartagena) are speaking in Barbara's apartment, Barbara calls Renee Victoria.
Selina steals a newly purchased half gallon of milk in a plastic bottle. When she opens it for the first time, the lid crackles as it tears away from the ringed plastic seal, as all sealed plastic bottles do. If it had already been opened, the separation of the ring seal and the lid would make no sound. When she pours it, however, there's only a cup or two within.
Catwoman is shown at being at Bruce Wayne's parent's murder when he was 10. But she has always been portrayed as younger than Batman, here she is at least 12 years older. It would make no sense that Catwoman is in her 40's when he becomes Batman.