From my sis: learn SOMETHING about the company. Sis let loose a rant the other day, while doing interviews, about all these people coming in clueless about the company. Look at their website. Google the news for industry issues/events/company releases. Try to do something! Having at least being able to mention the big splashy news headache of the week was something only one in about 40 people interviewed could address and this was going to be the job being interviewed for. Not asking for the interviewee to have answers, just have an inkling of the stuff the job / company faces.
Ok, that's that. DH says they can train for skills or knowledge needed, but a cheerful, able to get along with others, can figure out what to do kind of person is what they're after. Can you deal with difficult people and situations without losing your cool? Day after day after day? Navigate the political social minefield of the present working environment?
Hope this helps