Hi All - wonderful thread! This has been really helpful in prepping my UChicago interview tomorrow! Thought I would throw my two-cents in about my (successful) Harvard & Northwestern interviews.
How I Prepped/How to Prep: I have learned, for myself, that I do way better in all types of interviews when I'm feeling truly confident. It sounds silly, but I start off by reminding myself that I WOULD BE a great HLS student and great lawyer. If I'm really convinced, I can convince others by coming across as confident and relaxed.
That said, I did prep the following:
* Why Law School?
* Why Harvard?
* Questions to ask
* Reviewed my resume - came up with basic thoughts/summaries for each thing I did
* "Proudest Moments" - I came up with a couple of these. Short stories about accomplishments that may or may not be reflected on my resume. By having a couple prepped, I could use these stories as good examples for other questions, and have options for the question when it was asked, based on what we had already discussed.
* Weaknesses in my application - I didn't prep this at the time, but I think this one is REALLY IMPORTANT. Unless you are the perfect candidate, there is probably some portion of your application that is weaker. For me, it's my GPA (only a 3.7!?!). JS asked me directly about my college grades, why I thought they were slightly lower, and how I think I have improved in that area. Being a couple years out of school, I was able to say that I have honestly improved on my time management and am better at balancing work with the other leadership positions I have taken on (humble brag). I feel like having a good answer for this question, and tangible examples of why I think grades won't be an problem in the future is a big part of why I got in just a week after my interview. Being able to assuage them of any worries they might have as a candidate is one of the great opportunities of having an interview, and I would really take advantage of it.
Appearance & Set-up: I put on a nice blouse and cardigan. Honestly, over skype, I don't think they can tell too much about your wardrobe, so it was not a big worry. I actually had multiples problems getting connected correctly with her over Skype. She was patient and we troubleshooted the issue. I was worried it would make me look incompetent, but I think just being amiable about it made the problems a non-issue once we got talking.
Interview Questions: I interviewed with Jessica Soban, and so the questions were very specific to my application. She started with a softball about why I am interested in a particular area which shows up a lot on my resume. She also asked about my grades, as I said, "Why Harvard?" and then asked for questions.
I did an alumni interview in the fall. This one felt a LOT more like a job interview, and I dressed accordingly. He even told me that there were 6 or 7 categories that he would be asking questions about. The questions followed closely to resume, in general, and so I think having stories about each of your entries there, as well as a couple "proudest accomplishments" ready is what is key.