It's only minor, but I am watching GF1 now.

In the book, Kay goes to see Mama Corleone and discovers that Michael has been back six months. In the movie Michael goes to see Kay at school and tells him he has been back a year.

i find this an interesting contrast. In the movie Michael is descent enough to go to see Kay. In the book, she has to track him down.

Is there a reason for this, or is Michael just a bit more heartless in the book?