Had my interview, and like everyone else said, it is very conversational and casual. I was actually astonished by how tiny the group was that showed up. Only five of us total, and we were split 2 and 3 for the interview, 2 for fall and 3 for spring. We were told they do much of their weeding out during the actual application process, so it seems like at least most people who get an interview get in.
But throughout the whole thing they're trying to keep you calm and they imply you shouldn't see the other prospects as competition because they may very well likely end up being your classmates. Try to ask thorough questions, ones whose answers you can't find on their website, and I mean ask questions outside of the interview because we didn't have time during our interview to actually ask any before a student PT came to get us. Like he was still asking us questions as she knocked on the door. The spring cohort did, so I did all of my asking outside of the interview.
There were no off the wall questions. Like I said, very conversational. He'd ask, we'd answer, and he'd either bounce off our answers by providing advice like, "This is what you can do to manage stress," or he would challenge us. Like he asked how we felt about group studying, and I said it's effective up to a point and explained why. He then said, "Well, what if I came to your group needing help? What if no matter how many times you helped me I couldn't get it?"
It definitely was not an interview where you want it to end. I feel like my interview went well, but we'll see. Just show your passion and your eagerness. Don't be shy. During my interview, I mentioned some of the lofty dreams I had for the profession, but it shows I want to grow.