Factual error: After leaving Paul's apartment the first time Connie is shown running through Grand Central. She runs into a track tunnel, but the train's destination on the schedule board is displayed in blue, which indicates that the train is a Harlem line train (these headers are color-coded). However in the remainder of the film both Connie and Edward are shown getting off at a station next to the Hudson river which is served by the (of course) Hudson Line, which are displayed with green colored destinations on its schedule board. Long story short she's getting on the wrong train.
Factual error: The phone number Constance gives Paul has a 914 area code which is the Westchester County area code, a suburb just outside of NYC. In a later scene, we see Constance shopping at a supermarket presumably in her neighborhood as she is in the suburbs, but when she hastily decides to drive into NYC, she drives over an unknown bridge that would never take you from Westchester County to NYC.