At one point in the film, Nick is at her new apartment and 'buzzes' her room using the intercom. On the first occasion, the intercom panel has four buttons while later on in the film, it's a completely different intercom with only two buttons.
I saw that also, however, I realized that the building with the 4 buttons is her rented apartment, the one with 2 buttons is the one she buys and later moves into.
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