Sorry to hear the dings. BTW, if you have flexibility, you could re-apply for the next year and you might even get in. Stanford is one of those few schools that have blank-slate policy for re-applicants. I know a friend who was dinged without interview one year, and _accepted_ in the R1 the following year with pretty much the same application (with different recommenders I think!). So, it's all random!
My interview is scheduled for next week. Unfortunately, I am getting interviewed by one of the Adcom members. With Alumni, it is possible that you get asked questions that you already answered in your application somewhere, but an adcom member most likely would have access to the entire application. And, even off the interviewed candidates, 60% get dinged. So, please wish me luck!!