I was interviewed on-the-spot at a career fair. I spoke to an recruiter at length, and then a store manager. I got the sense that they are looking for a certain personality, type, that "It" person that stands out. Definitely show that you are charismatic and diverse in your interests. It was a challenging interview, as the questions were less about tangible achievements and more about personal philosophy and how you feel you would fit in with the Apple 'culture.' It also feels as though like recruits like, so look for a recruiter who matches you.