Factual error: Corleone and Roth meet in Havana in Christmas 1958. The initial scene shows a panorama of a full street with people and American cars passing by. Among the cars we see a Jaguar Mk.2 in the opposite lane driving away. New Years day 1959 Batista flees the country and Fidel Castro takes over. The Jaguar Mk 2 wasn't introduced until late 1959.
Factual error: When Fredo arrives at the hotel to meet Michael in Havana, the flag at the entrance is from the Dominican Republic, not Cuba.
Audio problem: When Fredo is wakened by a phone call from Johnny Ola, the audio doesn't match up with Fredo talking. You can see his mouth moving at times when nothing is said, and talking that doesn't match his mouth movement's. Any idea what the original lines were?
Other mistake: When Michael visits Pentangeli's house, Pentangeli closes the double door to the study. There is a dead bolt handle on the right hand door. There is no deadbolt coming out of the door side, nor a striker plate on the opposite door.
Other mistake: When Hyman Roth's assassin runs at the airport, he is turning around with one (of two) bullet holes already in his jacket before the sound of any gunfire. (03:10:50)
Chosen answer: They were not his actual grandparents, just people that knew his family and who helped Vito after his mother, father, and brother were killed. Vito refers to her as "grandmother" because they treated him like family. Their names are unknown.
raywest ★