I cannot disagree more strongly with most of this discussion thread. I loved this interview! Granted, I do not watch the live show, I download the audio and listen, and so I'm not sure if people were thrown off by non-verbal queues. Christopher Guest was remarkably funny, and if he seemed dry, that's just his sense of humor. This was a fantastic interview, full of personal stories, which had me laughing out loud at parts. The only part that I felt he held back about at all was his father's profession, and so what? If he didn't want to talk about what specifically his father did for the UN then that's his prerogative. All of the interactions with Sam were hysterical throughout.
Great job, as always, Kevin - fantastic show!