I hear what u are saying, but it just seemed like the presenter wasnt really that interested or was that enthusiastic.
It almost seemed like he was thrown to that segment on the run and just did it off the cuff like he was thrown in the deep end.
If the interviewer had some knowledge or passion for the silverball, it could have been a much better interview.

Anyone I ever interviewed for a job position over the years usually had done their homework and although nervous, so to speak, had quite alot of industry or job knowledge. I do however use the technique you mentioned in your last sentence when extracting information from the wife after she has been shopping,lol, I pretend I have no idea where she has been or what she has spent, and ask basic questions to look for nervousness, thus ensuring I remember to check the credit card statements.lol