I think the best thing to do is to start stacking things after he says "Alright then."
I've had one who literally talked my ear off and as if he had decided right after his second question to call it quits, he pulled out a preset questionnaire. He didn't write a damn thing down. I wish I did something but I hate making scenes.
Get bent Home Depot.
The only thing I can say is those interviews sound like they expect you to ask background questions of the company and expect you to be all psyched about being a team player.