Factual error: In the scene when Michael visits his father in the hospital in 1945 there's a NYC Fire Dept. Sign on the wall with the name of the Commissioner, Robert O. Lowery, who was commissioner from 1966 to 1973.
Trivia: The infant playing Connie and Carlo's baby son that Kay holds during the christening scene is Sofia Coppola, Francis Ford Coppola's daughter. Sofia later had a prominent role in Part III as Michael's daughter, Mary.
Trivia: In the scene where Vito is in the garden with his grandson, he puts a lemon (or an orange) peel in his mouth, and the kid looks scared. Well, the kid really is scared. Marlon Brando improvised that, and the kid wasn't expecting it.
Trivia: Marlon Brando won a Best Actor Oscar for his role as Vito Corleone. Robert DeNiro, who played the role via flashbacks in Part II, won a Best Supporting Actor Oscar. They remain the only two actors to win Oscars for playing the same character.
Tom Hagen: I'm an attorney for the Corleone family. These men are private detectives hired to protect Vito Corleone. They are licensed to carry firearms. If you interfere you'll have to appear before a judge in the morning and show cause.