There’s a 1968 TV show called The Summer Way that has been posted online by the Canadian Broadcasting Corporation featuring Norman Mailer and Marshall McLuhan in conversation.
Fabulous it is too: two intellectual heavyweights delicately tip-toeing around one another in front of a live audience and, presumably in those days, also broadcast live. Mailer looks very nervous early on and is clearly at sea, and in the end just muscles his way out of trouble. McLuhan is very calm, very cool, and seems completely in control. He just flies loops around Mailer, and the amused looks on his face at some of Mailer’s comments are absolutely priceless.
It’s about half an hour long and is pure historical gold. [Edit December 2017: original link now broken.]