This subject hits very close to Apples heart. I've notice that this one, about Fredo knowing or not seems to bring Apple to the front. She knows what she thinks and isn't afraid to defend her views. Every time someone brings this up again, she takes the time to set the record straight.
Good for her.
and even if the film has been out fifty years, they will bring these tuff question up. Mario is gone, FFC doesn't spill the beans. Some of these tuff question may never be answered.