Why didn't the partners immediately ask you to clarify the discrepancy between the numbers you stated on your app and the numbers you were telling them? Is there not enough time to have a bit of a back and forth?
I wrote a in depth essay about the whole experience shortly afterward while it was fresh in my mind. I'll likely publish it as a blog because I think it addresses quite a few things in a YC interview that I hadn't heard/thought of during my prep (and I've read all the prep blogs that have been written).