Also in the trailer:

Connie says, "You can save the Corleone family, I will help you!"

Vincent and Michael (in Sicily?) "I am your son, command me at your will." "Give up my daughter."

Michael says "Will you shut up?!" to Vincent twice, versus once in the movie.

Don Altobello and Michael in the beginning. "The Corleone family partners with the Pope? They may cry blashemy." "This is business."

When Michael makes his confession in the opening, he doesn't cry when he says, "I killed my mother's son. I killed my father's son."

If I find any more, I'll post them.