When I interviewed at OU a decade ago, the interview was benign. At that time, the Pharm D. program was a two year program after obtaining the B.S. Pharm, and most of the questions centered on why I didn't want to pursue a Pharm D. Of course, this is a moot point now.
There was a rumor that an interviewee was asked to diagram the Kreb's Cycle, but I don't know if it is true.