You often don't obtain very varied replies on the first best or worst, and you might know the answer already, so give the responder a little slack. Interviewers are always choosing a candidate they can imagine having on the faculty. Looking stuff up like faculty publications never works. If you try to learn what thirty people have written before you visit, you'll probably forget or get confused. Anyway, you can always ask.
Most people are happy to talk about what they've been doing.
You must have a job talk that contains a problem and some answers to the problem. Don't go before you have something to show. You must have a result, a punchline, something to hang your hat on. You need both theory and data, or something comparable if you are in another field. In other words, you need to engage debates in the field, and have something concrete, of substance.