Continuity mistake: When Pro meets Hoffa in Miami the cloud of smoke from his cigar appears/disappears randomly depending on the shot.
Continuity mistake: When Hoffa is eating an ice cream and JFK is shot he stands up and the spoon swaps between being in a 9 o'clock position to a 12.
Audio problem: During the award ceremony when Hoffa and Russ are speaking Hoffa says "right" but his mouth isn't moving.
Chosen answer: First off his name was Chuckie O'Brian. Jimmy Hoffa wasn't his biological father, he was more in the nature of a foster father. Second, he probably knew what happened. What was Chuckie going to do? It was a sanctioned hit. And if he went to the police he would have ended up the same as Jimmy Hoffa. They put him in the middle of it to keep him quiet. If he goes after the people who did it, he's as good as dead. If he talks he could end up in jail with them, and the mafia will probably kill him anyway.