Trivia: Robert Duvall was asked to reprise his role as Tom Hagen, but an agreement couldn't be made on the price.
Trivia: In New York, Vincent is showing Mary the old olive company where Don Vito Corleone once worked and then owned. An elderly white-haired lady with a friend comes up and greets them, and tells Vincent about the troubles of the neighborhood. That lady is played by Catherine Scorsese, mother of Martin Scorsese.
Trivia: Talia Shire and Sofia Coppola, who play aunt and niece, are aunt and niece in real life.
Trivia: John Cazale appears as Fredo in archive footage from the other films. Although he was deceased by the time the film was released, he still maintained the distinction of having every film he appeared in earn an Academy Award nomination for Best Picture.
Answer: Michael is trying to divest the family of all ties to organized crime. Internazionale Immobiliare is an international real estate concern and owning it would legitimize the family. Michael is attempting to buy out the Vatican's 25% of the shares in it to gain controlling interest, but the other families either want in on the deal or want to steal it out from under him, forcing him back into his old criminal ways.