over ANALyzing ... So we're anal-retentive about this? Who, us?

IMO, analyzing aspects of the movie and enjoying the movie's entertainment value are not mutually exclusive. Both can be done at the same time -- and that's what we're doing.

Apple, you may well be right that there is no theory about the assassins that will fit because it wasn't thought out in the narrative. But the enjoyment is in trying to find one that's reasonable -- even if only 80% or 90% plausible. It's like working on a challenging puzzle. Another factor that makes it interesting is reading what others think, especially when they notice implications and relationships that you and I might miss.

You got it! Many films are forgettable right after one sees them. We don't even care about the plot holes and the unanswered questions. That's what's so great about the Godfather movies. They're such masterpieces that we can't help but be fascinated with every mystery they present.