Continuity mistake: When Carrie is trying to hail a cab, you can see her walking down a busy street in NYC. Big's black sedan is nowhere in sight. But a moment later; his black car suddenly pulls over to the curb right behind her, as if it was just next to her in traffic. There was no time for it to have come from anywhere else, or across from a far lane. The car was not further down the street coming towards her either, as you can see from the long shot. Big's sedan was not present in the street, before it pulled to the curb behind her.