At interviews I've had some that have read and underlined parts of it and others that told me they received it a few weeks earlier, but haven't taken the time to even glance at it. Others wouldn't say anything about it. So I would say it depends on the school and the interviewer. As for repeating things from you personal statement, I only did that if I was asked a question that I had already addressed. I would say something like, "As I wrote in my personal statement..." and then expound on it. Most times I was asked questions that weren't addressed as part of my personal statement.