Nina's hair changes when talking to Darius after their first date.
Nina and Darius enter his apartment building, then his apartment. Once, inside , she begins to photograph Darius. Where did the camera come from? She clearly didn't have a camera when she entered the building.
Darius finds Nina's address from a personal check. In the next scene when Nina allows Darius to enter her home she tells him she's "Housesitting".