I had an admissions person, a PhD professor, and a D.O.
Started right off the bat with the BIG THREE (if you don't know what the big three is, you are dead in the water), but they kept it light and fun. 20 min flew by and they stopped asking questions at 20 min on the dot. They asked me questions you can find on the interview questions on this website and threw some more into the mix. Nothing too crazy; just be ready to think and express your opinion, and defend that opinion. There are no wrong answers, only what you think/feel and how strongly you can defend your position. You might have an answer that the interviewers don't agree with and that is fine as long as you can argue for your point. Don't change your mind only to appease them.