Have you ever spoken in front of giant crowds and cameras for the world to see? Have you any idea how nerve-racking it can be?

Being nervous can often elicit the same characteristics as being unprepared. I highly doubt they just decided to hold the Q&A all willy-nilly. It is far more likely they were simply nervous...

These aren't exactly "celebrities" who would be accustomed to large audiences or camera time, so I think we can cut 'em a bit of slack, no?