PENTANGELI :You remember Willy Cicci, don't you, Freddie? We was all together with the old man Clemenza in Brooklyn... before...uh...
FREDO: We were all upset about that.
PENTANGELI: That's what I'm here to talk to your brother about. What's with him, I got to get a letter of introduction to have a 'sitdown'?
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Interesting. I wonder what made FFC change the dialogue in that scene to a dialogue that implies that Clemenza died from something other than a heart attack?
What else changed? All I remmeber different is that Fredo says something about a heart attack and Cicci says something like "No, no, that was no heart attack."
You just answered your own question!

In the movie, Cicci's line "No, no, that was no heart attack." implies that Clemenza died of something else. In this draft, nothing is implied and later on down the script a heart attack is mentioned. Cut and dry. In this version he died of a heart attack. But in the final script Cicci is given that line which implies that Clemenza may have died from something other than a heart attack. So back to my original question, I wonder what made or inspired FFC to throw in that implication in adding in Cicci's line? Was it to set something up for later? Cinematic license?