I ad-lib. Did my research before applying, jot down the structural questions during resident time (how’s X/Y/Z?) and ask faculty-specific questions during interviews
A quick google search of each interviewer is all I do day-of. For example, one of my interviewers had a ton of research in palliative medicine, and I have a background in doing some hospice stuff, so I was able to bring that up. I’m super careful, though, because you don’t want to come across as a know-it all or OVERLY prepared like you’re compensating. I prefaced what I said by literally saying, “I do a quick google search of all the faculty I interview with, and I noticed you…” so that it didn’t seem pretentious