I had already read the novel.
OK. So this thread is for those who had
not read the novel first. Of course, when I read the novel, everything was quite clear. But watching the film the first time without knowing who is important and who isn't, I think it's hard to follow. (This has nothing to do with history knowledge btw.) When the wedding scenes begin, we are being overwhelmed with lots of names and information. For example, the scene between Sonny and his wife is much more intense, than the arrival of Don Barzini who at that moment appears to be just another ordinary guest who happens to deserve the politeness of being welcomed personally.
Don't be a smart a***, olivant.

You don't have to explain me the things about Tattaglias, the winter 1946, etc.
This thread is meant to be for those who first saw the film to be open and honest about our ignorance with some little details.
Please, don't spoil this little game!