Some people had one faculty and one student, I had two MDs. Both of my interviews were very relaxed and I really got the feeling that they were just trying to see what type of person I was and if I'd fit in well with the class. The first interviewer didn't look at my file at all, so it was a "tell me about yourself" interview, the second one was open file, but both were low stress. It was my second interview, but I was still really nervous. Don't worry though, you'll see once you get there that you'll be surround with a number of quality people that will put you at ease. Hanover is beautiful and very rural, but it's a great school and if you can get over the lack of city and non-white patients, then you'll probably love it!
I thought the school was amazing. I stayed with some students and even though they had a final the morning of my interview, they still spent over an hour talking to me about the school, their class, and the faculty. My hosts had nothing but great things to say about the faculty and administrators and they gave me the impression that Dartmouth bends over backwards in order to make sure that the students do well. They said it wasn't uncommon for classmates to spend a couple hours typing up notes and then e-mail them to the rest of the class (go P/F) and that a few times the faculty set up mock practicals and mock exams in order to get ready for the real deal. I'd keep blabbering but it's time to study for some finals. Good luck with the interview! I loved everything about the school, hopefully you will too!