PrimeGoofs
Continuity
After dinner, Rafi and Lisa are in the kitchen putting away the food. Rafi puts the meat in a food container and Lisa closes it. After Rafi sits down the same container is open again.
Two obviously-different red Chrysler convertibles are used in the early sequence of David and Morris driving to Morris' ex-girlfriend's house. Close-up dialogue scenes filmed in the car show a large, conspicuous high-mount brake lamp on the car's trunk in the middle background, but exterior driving shots of the convertible show a different model, with no trunk light at all.
In an early scene outside and inside a cinema, which has two screens, the sign above the entrance shows that Screen 1 is showing one movie and Screen 2 is showing another movie. But in an interior scene, a sign shows that the movies are reversed.
Factual errors
Giorgio Armani in the special thanks in the end credits is spelt Georgio.
Miscellaneous
In the final scene, the door windows at the restaurant are covered with snow/frost but no other windows have the same condition including other buildings and cars.
Errors in geography
When David and Morris are going to throw the pie, the shot of the Verazzano Bridge is a different location than the background scenery when they are talking to each other. The bridge shot is from 3rd avenue on 100th street, while the background shots (when they're talking to each other and are shot from the front) are from elsewhere.