I think #8 (BE YOURSELF) should really be the first thing on the list. As someone who is now working at a startup straight out of [a really random, lesser well-known, liberal-arts focused] college, the single most important thing is to see how well you connect with the team.

People are really the most important part of any startup in my opinion. Don't try to be someone else. If there isn't a fit, you shouldn't try to force one.