When David falls on the taxi cab, he clearly breaks the glass; however, when the taxi is driving away, the glass is fully intact.
When David is in New York the taxi that he is supposedly in is a Ford Crown Victoria but when he gets to the hotel he gets out of a Chevrolet Caprice.
The return address written on the letter from Julie, gives the address as being in Westport, CT, but the postmark on the envelope says Westpoint, CT.