Hey there, congrats on getting the interview! i interviewed there in Dec. and was accepted a couple weeks later. I was interviewed by 2 doctors, one was more laid back and quiet than the other who was a bit more pressing, but both were really nice. They asked me the weaknesses question, I answered by saying that sometimes I try to take on too many things at once, and sited how i had done this at the beginning of my undergrad career which resulted in a couple mediocre semesters early on. I turned it into a positive by saying that now I have learned that I need to focus in on a few things and not try to do it all. I think the key is turning your weakness around and making it seem like you've learned from it or have worked on it and improved.
They asked me a lot of questions as to why i wanted to go to COMP above all the other schools i applied to, and why i applied to both MD and DO and what would i do if accepted into my top choice MD school and not top choice DO school, and all sorts of combinations they came up with. They asked a lot about clinical exposure i'd had, my current research, and about my college experience. It was pretty conversational and by the end of it i felt pretty much at ease. it was my 1st interview too so naturally i was nervous. but don't worry about it, seriously just be yourself, relax, and know your application well.
Good luck! Any more ?'s just ask!