1) The set-up of the interview room is surprising, its a really small table, with the interviewers all sitting on one side of the table, and you sit at one, so you gotta move your head back and forth to make eye contact, and the interviewers are really close (but makes you comfortable that they arent "high" above you.
2) No matter how much you say you arent going to be nervous, its just a natural thing, and you have to try to calm yourself down so you can focus on the interview.