From: xHFx | #008
I'm just curious because I wonder if they pick people based on their interview.
Uh, yeah. The interview is how they choose who they're going to hire from a larger pool of applicants. Just getting the interview is one cutoff you got past, and now you have to get by the second cut that they make based on interviews. So yes, your answers are definitely important.
From my experience the 'weakness' question isn't really asked so often since most companies know that it's a stereotypical question so people have a canned response prepared for it. My friend got asked "what are your two biggest weaknesses" once though. Either way, it is a stereotypical question so you should have a good response. Most people do something that's sort of cheesy with a weakness that isn't really a weakness ("I'm too detail orientated, so I spend extra time checking over my work before I'm done"), but you can do other things like bbbtime posted as long as you can come up with a way of how you're working on it.
Asking about qualifications can be dangerous if you aren't sure if you're fully qualified. If you are you probably don't want to draw attention to that fact, and asking about it might be perceived as you being concerned about your own qualifications. If you are definitely cut out for the job though, you might want to do it so you can demonstrate that you are a suitable person to hire for the position.
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No amount of planning will ever replace dumb luck.