I interviewed there in 2000. Probably hasn't changed since then.
I don't think that any of the questions from the "gang bang" were standard interview questions. Ones I got included:
"Trace the path of a red blood cell from the heart, through the placenta, and back to the heart."
"If you were a transplant surgeon and a famous person (I think that one of the NY Yankees who destroyed his liver with booze had just jumped up on the transplant list and got transplanted very recently) came to you with offers of big contributions if he could get a transplant, what would you do?"
I don't remember the rest. I was told by one of the residents at the time a the dinner before the interviews that what they want to know is if you know how to say "I don't know" as they are looking for people that are going to recognize their limitations and seek help. Not sure if it's true, but that's what they told us.
Anyway, you can't really prepare for it, so just go in, try to be confident without being cocky, and when you reach your limitations, tell them that you aren't sure. If you know the answers, try to dazzle them, I guess. That's coming from someone who didn't match there, though.