During the car chase early in the film, the car carrying Edward Norton and Ethan Suplee runs over the sidewalk as it rounds a corner, clearly showing the curb ramps for the handicapped, that would not have been installed until after the Americans with Disabilities Act of 1990.
When the Edward Norton character asks for "Mr. Horowitz," the receptionist corrects him by saying "Ms." The term is used again later in the film. While the term existed prior to the 1950's it was not in general use until the 1970's.
Alec Baldwin's character (based on Robert Moses) wash shown pulling out a pack of Chesterfields (an unfiltered cigarette) and removing a smoke. However, the next scene and other subsequent scenes showed smoking with filtered cigarettes instead.