In the show, The Quizmaster got all upset because he didn't know, and started fighting and stuff. But this guy was like three times Batman's size, and only about three feet away. All he had to do was pull of Batman's mask, see his face, and answer "Bruce Wayne." And here he said he knew everything.
I guess it can be chalked up to knowledgeable people's seeming inability to apply their knowledge. I wrote a while ago about how I couldn't put two and two together, and I don't even know all that much. Maybe a lack of knowledge forces people to be more creative or something.