Re-read my AMCAS, read this site, the school's site
What impressed you positively?
I like the program, systems based in the second year, and block testing, so you don't have tons of finals all at once.
What impressed you negatively?
Everyone there just seemed kinda blah. All of the students seemed content with the school, but no one seemed really glad to be at SLU. Same with the city. Everyone seemed to think St. Louis was alright, but no one was like, "I love it here". That's too much money to be spending on a school to just be "ok with it".
What did you wish you had known ahead of time?
If you get to the conference room before your interview, they have a great breakfast spread, so don't waste your money buying breakfast or coffee somewhere.