Factual error: In one scene we are introduced to Idlewild Airport in 1963. We're shown a couple of aircraft in flight and one of the aircraft is a Boeing 747 in the livery of KLM Royal Dutch Airlines. The Boeing 747 didn't enter commercial service until 1969. Additionally, one of the 747s shown is actually a 747 'SP' (for 'Specual Performance') a version of the Jumbo Jet with a shorter fuselage which did not enter service until the mid 1970s.
Factual error: Early in the film, when Henry Hill is selling Pall Mall cigarettes out of a car trunk and is arrested, there are UPC price codes visible on the cartons of cigarettes. UPC codes were not used on products in the 1950's when the scene is taking place. They were introduced in the mid 1970s. (00:13:20)
Factual error: When Henry meets with Jimmy after his arrest, the scene takes place in 1980, yet a 1984 or newer white Corvette is seen parked across the street at the end of the scene. (02:14:50)