The meeting of the mobsters in upstate New York occurred in the fall of 1957 but the State Trooper who spotted them was driving a 1959 Edsel which would not have debuted until the fall of 1958.
When Atty General Robert F. Kennedy is given notice of Giancana's lawsuit against the Justice Dept.; he is shown sitting on the wrong side of the desk. The drawers, which are supposed to be on the side that he is sitting; are visible.