-what brought you to x school? what's kept you here?
-what's your specialty/field and how did you choose it?
-what opportunities are there for a student to do off-site clinical rotations?
-are there opportunities within your curriculum to do meaningful research?
-is there anything you don't like about x school? (much easier to ask this question to a student interviewer)
-do the attendings/residents enjoy teaching? (student interviewer)
-are the faculty approachable? (student interviewer)
-collegial or competitive atmosphere? (student interviewer)
-any elective courses during 1st/2nd year? (either humanities type courses, clinical electives, shadowing, etc)
-in places like philly/new orleans: do you feel safe walking around the campus/hospital at night?
I generally found people to give honest answers to these questions, even the ones that might put their school in a bad light... hope these help.