I applied online for the store in my area. A couple of days later I received an email inviting me to a hiring seminar. The email was generic and I assumed most people who applied got this email.
My hiring seminar had about 10 people in it. Dress ranged from business casual to jeans and t-shirt (me). We were cheered into the store by ten or so apple employees, this caught me off guard as it was very early in the morning. We were sat at a center table and a specialist talked to us about apple retail and specific roles within the store. We were also shown several videos about the apple philosophy. After that we were broken into groups and told to act out a situation in which an apple product might be useful, each team was given a prop. All-in-all the process took two hours. We were told we would hear back in a week or so whether or not they were interested. My advice is to answer questions and work well with your teammates.