Like about how it wasn't Tommy that went on the double date with Henry when he met Karen. For some reason I don't think it was Paulie Jr. who introduced them. I want to say it was another of Paulie's sons or one of Tommy's brother. Haven't read the book in like 10 years though, so I can't really remember.

Edit: I'd also heard the John Gotti thing. Or at least that he was there when it happened.