I wanted to revisit this thread because I have some additional questions that I think could get interesting answers:

Michael was frantic to get Fredo with him on the plane out of Havana. We can understand why. At that point, all he knew was that Fredo betrayed him, but he didn't know who else might have been in on the plot besides Ola and Roth. And he had to return to Tahoe, where, possibly, Rocco, Neri--maybe even Tom--could have been co-conspirators. Michael had good reason to suspect everyone.
But, in the 48 hours or less that it took him to get from Havana to Vegas, his sense of urgency disappeared. Told by Tom that he thinks Fredo must be in NY, Michael simply tells Tom to "get word to Fredo..." I infer that Michael believed Tom knew where Fredo was and could contact him immediately. BUT: Notice he doesn't say, "Find him and bring him here immediately." In fact, his next interest in Fredo occurred after he found himself looking at five counts of perjury. Then he tells Tom, "I wanna talk to Fredo"--and Fredo appears tout suite. So:

1. Why did Michael lose his sense of urgency in grilling Fredo? The obvious answer is dramatic license--having Fredo appear in the boathouse before the second Senate hearing had far more impact than if he'd come to Tahoe right after Havana--and it made for one of the greatest scenes in the Trilogy. But I'm hoping people here will have other theories.
2. How did Fredo know "they got Pentangeli--I can tell you that," when Tom and Michael hadn't known until just before that scene? Reporters covering the hearing could have looked at the Family chart, inferred that Frankie could have been the secret witness from his position on the chart, and printed it. But, given the ultra-high level of security around Frankie, the Senate committee chair would never have publicly revealed the specific identity of the witness he was going to use against Michael. Fredo might have read that speculation in the newspapers, but his answer was definitive. Why? I can't believe that Roth would have told him.
3. Fredo tells Michael, "That Senate lawyer, Questadt, belongs to Roth." That seemed to come as a complete surprise to Micahael. How did Fredo know that? Again, I doubt that Roth would have told him any more than he would have told him Pentangeli survived--Fredo by that time was useless to Roth, and and Roth would never have trusted a dunce like Fredo with any such valuable info at any time.

Your thoughts?