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.

Revealing: In the scene where Karen is too afraid to accept free clothes from Jimmy and speeds off, the yellow NY state license plate falls from the parked car to reveal the modern white one underneath.

Continuity: When Henry Hill is in jail and talking with his wife, the child is playing with a stack of coloured toy blocks. The order the blocks are stacked in change in different shots.

Continuity: The scene in the restaurant where Joe Pesci messes with Ray Liotta saying, "What, am I funny, am I a funny guy to you?"  watch the drinking glasses on the table. The drink levels are going up and down with and then without ice.

Continuity: In the same scene, the actors walk past the rear of an easily identified 1965 Chevy Impala. Occasionally Chevrolet introduced vehicles early, but never two years early.

Continuity: When Tommy shoots Spider in the foot and he goes down, Henry is playing cards at the table, then in the next scene Henry is helping Spider up, then the very next scene Henry is back at the table watching Spider crawl on the floor.