During Vincent's final scene, while he is holding Marcia she has mascara under her eyes from crying. When they turn to walk towards the street her make-up is perfect.
During the chess game at the beginning of the movie some of the pieces change positions between shots, despite the fact that no moves are being made.
At 01:45:31 David is shown walking up to the upper level as Gary leaves. He then walks back down to make the toast with everyone else at 01:45:46-48. When Gary comes raging back in at 01:45:50 it is shown that David is on the upper level near the window without moving at all. Gary then attacks him and they crash out the window.
Amongst the "New York" street traffic was a Sanipac dump truck. Sanipac primarily serves the state of Oregon and not New York or anywhere on the east coast.