If that happens to you in the future, be honest and say that the other interviewer already asked you the same questions. Not doing so probably worked against you, as someone probably realized at some point that the same questions had been asked, and then they looked at each other in confusion wondering "Why didn't this guy say something?"
The funny thing was, in interview #2 I did mention that that they were asking me all the same questions, once it became clear that that was happening. The interviewer was like, "Oh? Really? Well this is our interview process," and then kept going. And these were 30-45 minute phone interviews, too. It was really strange.
That doesn't even make any sense. Why would you intentionally ask people the same questions two times? Something is screwed up over there. I'm surprised you stuck with it after that; I would've turned down going any farther with it. If their interviewing is that broken then you know the work must be too.
