post-interview concerns/vent.

I had an interview last Thursday. I found out today that I was not selected for the position. The entire process starting from when I arrived at the hospital for the interview until today seems (for lack of a better word) sketchy. Anyway, now that I know I was not hired, I keep thinking about the interview. I felt/feel like it went fairly well. At the beginning of the interview, the interviewed said "I know you have a history of working at ___ (a local grocery store)." The bulk of my work experience is this job as I've had it for nine years now. Basically, I got the impression that she expected my answers to be about working at this place, which was the case. Now that I know I did not get hired, I'm questioning this. I wonder if I should have tried to tie in clinical experiences. However, there was a time, later in the interview when she asked specifically about clinical experiences. I don't know what to think. I really wish I could ask what went wrong....