My two cents...
I'm a DO applicant applying for MD EM programs... indeed a little fish in big pond. But anyways,
I interviewed at a good community EM program, and didn't feel the interview was at ALL a good one (in fact I felt it was one of my least impressive interviews)... I thought the PD was very uninterested in me, he didnt' ask me anything, he just gave me advice about the whole application process (Yeah, I know, go figure, what the heck). Anways, shortly after I got a letter in the mail from them, telling me that all the interviewers were very impressed with me (it was a more personal letter, had all the attendings names in it, etc), and that they would like to see me there next year.
I was blown away as I thought I screwed the pooch on that interview.
What I would do, is try to find out people in your school or people on the interview trail, or, especially on THIS website, find people that interviewed where you did, and see if they have any post-interview correspondance. This website is anonymous so the info can stay anonymous.
Q