When Robin is trying to inform Holly that her boyfriend is dead she writes "MORTE" on the window and tells it is French for dead. In French, "morte" means a woman is dead and "mort" is used when a man has died.
When the doctor is talking to Jane after Robin is rushed to the hospital, she says that Robin is "going to the eighth floor". But exterior shots of the same hospital throughout the film show that it is only about four stories high.
After leaving NY, Jane and Robin appear to drive an entire day & then spend the night in a motel. There, Robin mentions to Jane that in order to get to Pittsburgh by noon the following day, they'll need to leave by 8:00am. Pittsburgh is less than 6 hours from NY which means they would have only driven 2 hours on the 1st day before stopping to stay overnight in a hotel.