I wasn't asked ANY questions so really I can't say. My interviewer literally just answered questions the whole time and had no questions for me. It was almost awkward because it was so laid back.
Read SDN forums and had previous interview experience so I was familiar with what questions might be asked. They went over most of the questions I had in their extremely long powerpoint presentations so it was hard to think of anything else I really wanted to know.
What impressed you positively?
Everything seemed pretty nice and the students seemed really friendly. Ann Arbor would be a cool town to live in.
What impressed you negatively?
They focus too much on research. That's not a bad thing, but if you aren't interested in doing research...not exactly the greatest school. I've heard numerous complaints about their lack of clinical experience at the school and this was confirmed by my visit.
What did you wish you had known ahead of time?
--nothing--
What are your general comments?
It was unbearably easy. Just be social with the other students present and be yourself.