Yeah, these interviews aren't a huge deal. The articles they use are short, and they aren't expecting you to cite caselaw. My year the snippet was a very common knowledge happening regarding Netflix and my highly non-legal response boiled down to fairness. They want to see you think and defend your position a little.
Know your resume, be able to answer "why law", and know a couple firms that are great at what you want to do. That last part seems like something you may want to cram, but it isn't. "I really think I want to do M&A, so a firm like Cravath or Sullivan & Cromwell would be a good place to get started." "Litigation is my main focus coming into law school, but I also think I want to try some sports law work, so Proskauer would be my preference." Either statement has you 80% of the way to a great answer. Vault, google and TLS can tell you which firms are "best" at what.
This may not be comforting, but 90% of what is going to factor into your candidacy isn't within your control. Undergrad, grades, LSAT, where you get accepted, participation in an SEO program, and prior post-grad work experience. A well written "additional information" is good, but you only get 2000 characters. Unless you can't act like a normal person for the length of an interview, you're as in contention as anyone else.
The program accepts ~95 ppl a year, so this is going to be your introduction to the seemingly random unfairness that is law school. Stop trying to divine info from interviewee application dates, or trying to get some edge in the interview.
You want to help yourself get admitted to the program? Here are my tips, in order of importance:
1) Have a good application (90% of this is already decided as I stated above)
2) Get accepted to the T14 (all markets), or UCLA(CA), UT(TX), GW(DC). Atlanta is new, so maybe Emory for that market.
3) Don't be a weirdo
4) Get an alumni rec if you know an SEO. (Not sure if you know an SEO? Do a Facebook search. Type "SEO" into the search bar, click the spyglass and see if any of your friends used the term. Law program alumni are obviously preferred, but anyone who was in the career program is better than no one)
5) Go to Harvard or Columbia. Depending on the year, a plurality or majority of SEOs seem to go to these schools. This is correlation, not causation. They are the top ranked large class size schools, so this isn't unexpected.
...) Everything else
infinity) Read short articles about legal topics and think about your opinion of them