Keep in mind that authors and script writers have to inform the audience about characters motivations, etc. and about the relationships among characters. If you didn't read the novel, then you wouldn't know about Luca or his relationship with Vito or how Vito was involved with Johnny. If Michael doesn't introduce Tom by his last name, then you Kay doesn't ask about that and Michael doesn't get to tell the Sonny found Tom story. It's all foundational.
"Generosity. That was my first mistake." "Experience must be our only guide; reason may mislead us." "Instagram is Twitter for people who can't read."
