No, every job interview should also be a chance for you to evaluate the company that you might be working for. The interviewer is the best proxy you have access to before you are actually hired.
He meant, "I found out that I am better than the Peter Norvig".
No, that's not what I meant. I don't think I'm better than Peter Norvig; nor do I think Peter Norvig is better than me. Our interests are too dissimilar for any fair comparison to be made.
By "... or I interviewed him" I meant in the sense of a journalist or researcher interviewing someone in order to gain information -- in order for me to decide whether I wanted to accept Google's offer, I needed more information about what working at Google Research would mean, and Peter Norvig was the obvious person to provide such information.
