I haven't been rejected anywhere yet, but I've been waitlisted twice and I suspect the rationale behind those waitlistings may have to do a lot with the stuff being discussed in this thread.
Mosspoh, man, I know the feeling. I really do. My first interview was at DMU, and I came out of there naively thinking I had done pretty well - and given my stats (3.63, 31) I figured I had it in the bag. WRONG! As the weeks wore on I came to realize that some of the stuff I'd said in the interview was simply foolish...for instance, I talked down my undergrad school a little bit and wasn't as smooth with some of my answers as I could have been.
Lesson 1: At an interview, don't talk about anyone else's program. Period.
One other thing I first noticed at this interview is the fact that osteopathic medical schools seem to stress the "individuality" of their candidates far less than do allopathic schools. This seems a bit counterintuitive and confusing at first; after all, when you apply to MD schools you're told to try to "stand out from the pack" and "make your application as distinctive as possible" because if you don't, you'll get "lost in the crowd", etc. However, at DO interviews I've gotten the distinct feeling that DO schools don't really want candidates that "stand out from the pack" and that in trying to appear that way, you may wind up shooting yourself in the foot. It's as if they're looking for an archetypal "osteopathic candidate", and those who don't fall cleanly into that category may simply be written off as "oddballs".