Hi Brian_S and welcome!!
Interesting tidbits:
Would anyone have ever noticed this:
"Originally the actors in the flashback scenes wore pants with zippers. One of the musicians pointed out that the zipper had not been invented at that time, so some scenes had to be re-shot with button-fly trousers."
Also historic that Brando & DeNiro are the only actors to win oscars for portraying the same character.
This is interesting as well:
"As the "deceased" Mama Corleone, Morgana King only appeared in the coffin for the establishing shot where her face is clearly visible. In all other shots, Coppola's mother, Italia Coppola, stood in for Ms. King since she (King) initially refused to be in the coffin at all."
TIS