This may have been said but couldn't they have had a better way of Michael finding out that Fredo was the traitor, even as simple as him overhearing them in the bathroom talkin to johnny ola about how he didn't want it to happen this way. I mean there is no way Fredo could be that stupid. "Yah Johnny Ola loves this place but oldman Roth never comes here." Come on he can't be that stupid to say that in front of mike. The only thing I can assume is that he must be really really drunk, but they did not do a good job of making him look drunk.