Thanks everyone for your info on the interviews. I find it very helpful, as having insight into what could be asked makes the whole process seem less mysterious and scary.
I checked reddit after reading this comment and couldn't find anything regarding directing grad school other than a couple questions people asked years ago that had very few responses on r/theatre. I feel pretty confident in my search on there but I don't use reddit often so it's possible I could be missing something. But as far as I can tell, this is still the only resource that is like this forum!
I wish you all well on your interviews! I have mine scheduled for around mid February, so I'll be spending all my free time prepping!