At one of my interviews the interviewer asked me to teach her something. I don't think this is super common, but a PT I shadowed told me it was a possibility so I was at least a little prepared for it. She was definitely more interested in how I taught/handled the situation rather than what I was teaching. I taught her about health insurance because it is something I know a lot about lol.
Other than that, I was asked the basic interview questions like why this school, why PT, how you handle stress, tell me about your PT/job experiences, etc.