I found this Christopher Lydon interview of Errol Morris on Morris' web site. It's pretty interesting to hear Morris speak as interviewee. The show included callers and challenges from Liden. Morris seemed not to mind. The discussion is pretty indepth and worth a listen. Morris gives his responses some thought and doesn't sound evasive.
Morris twists the saying "Seeing is believing" into "Believing is seeing". I have to admit, he has a point.