Continuity mistake: When Don Vito Corleone gets shot, the camera angle from the side of the car shows Fredo bent over trying to pick up the gun he dropped, but when we see him from the camera angle from above, he's just walking to the front of the car. When the angle cuts back to the front of the car, Fredo is once again bent over trying to pick up the gun. (00:43:10)MCKD
Factual error: The Cadillac Miller and Cadillac Meteor flower cars at Vito Corleone's funeral are an anachronistic impossibility, given that he died some time in the summer of 1955. With two exceptions (one from 1951 and one from 1955), the Cadillacs serving as flower cars are 1956 models. Although a 1956 Cadillac Fleetwood 75 limousine also makes an appearance, it's plausible that the funeral could be taking place at a time when the first 1956 Fleetwood 75's were released. Miller and Meteor, however, did not begin converting 1956 Cadillacs into flower cars until 1956 proper.
Continuity mistake: Before Paulie is shot, Clemenza gets out of the car to relieve himself and walks only a few steps away from the car. As Clemenza hears the gunshot, he looks back at the car to see Paulie slumped over the steering wheel, and the car is a much greater distance away, than just the few feet he had walked away from it. As Clemenza walks back to the car, it again takes him only a mere few steps. (00:54:40)
Continuity mistake: When the baker is meeting with Don Corleone about keeping Enzo in the country, he's holding a shot glass in one hand, and a thin cigar in the other. When he reaches out to clasp the Don's hands in gratitude, the items are gone. A split second later, they're back. (00:11:20)
Continuity mistake: When they're all deciding whether to wait until the Don is better before making a deal with Sollozzo, the cigar box is closed. The camera cuts away for a second, then back and Sonny closes the miraculously open box. He can't have opened it while the camera was elsewhere, because opening it would have taken the lid right past the camera. (01:09:30)
Continuity mistake: In the first scene, the undertaker Bonasera asks the Godfather for help. When the Godfather gets up from his desk, the rose in his lapel is either fresh and straight or slightly wilted and bent in alternating shots. Also, later in the wedding scene, this rose keeps recovering from intermittent spells of withering. (00:06:00)NancyFelix
Revealing mistake: When Michael is riding in the car with Sollozzo before the assassination, notice the headlights in the rear window during the close-up. You can notice that many of them move directly on top and underneath each other, impossible for real car's headlights to do such a thing. (01:21:25)BillyBlake
Continuity mistake: Outside the hospital McCluskey punches Michael. A few days after the episode outside the hospital, Michael shoots McCluskey and Sollozzo at the restaurant, but there is no mark on his face where he was hit. Then in Sicily when Michael meets Apollonia for the first time, there is still no mark on his face, but suddenly at Apollonia and Michael's wedding, he has a large mark on his face.don_corleone