Good point TB. In Jack Nicholson's Hoffa, Hoffa was all surprised by that arrangement with Nixon which was absurd because he would have had to agree to it before his release. But in The Irishman Hoffa does reference $5,000 paid to Nixon's campaign.

Another part they could have done a better job of explaining was the murder of Colombo. Unless you're a Board member, a viewer probably wouldn't understand why Colombo was even in the movie or Gallo's part in his murder.