As with other posts, its not over until they tell you it is!
As for interviews, even stand outs can get shut out. I hear among professional interviewers, that your first 30 seconds (walking into the room) set the pace. How is your posture, are you smilling, head up? Direct eye contact is important. Some people may argue but the unsaid things go a long way.
Secondly, how do you respond to questions? Do they ask you to clarify or elaborate your answer? For example one person (male) I knew was asked the following question "how would you feel if you were a 13yr old girl and you just found out you're pregnant?" Answering "worried" may not cut it! Elaborate on all your responses so the interviewers get a chance to see how you think. Also hold your ground on your answers. Often interviewers may try to modify a situation and see if you flip-flop on an issue; don't unless you think it is really necessary (but then clarify your previous response).