I shadowed three physicians (~60 hours) so not a lot either. Most often it was super general like "what did you think of your experience" and "do you see yourself choosing (insert specialty here)?"
One of my interviewers was on top of her game and had read my app inside and out (which I appreciated). She noticed that one physician was a sub-specialist in an under-served area and the other was a primary care doctor in an affluent location. She asked me to compare and contrast the patient populations that both doctors served. Questions like this one you likely won't be able to anticipate, so don't stress about it now! (Which I know is hard to do!
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Edit: Tangent on interview tips. The advice that helped me the most to prepare for interviews was to first re-read my application. Then, reflect on my main experiences to see what I learned from each of them. I also thought of specific anecdotes that demonstrated the following FAQ 1)a challenge you overcame, 2) working in a team, 3) working with someone with whom you disagree