Applied online and got invited to a recruitment seminar with about 20 other people at the Apple store. Filled out an information sheet, name tags, and introduced ourselves. After being presented (through slideshow and video) about the entire Apple retail experience, we were grouped into teams to present an Apple product. I would assume its important to practice your presentation skills. Practice standing up properly and speaking with a clear, articulate voice. Then it was a short Q&A with the staff.
The group interview process was about 2 hours. I dressed business casual, sports coat, button down shirt, slacks, and rubber soled leather shoes. There were people that dressed way to casual (torn jeans, old t-shirt, shorts)
I got a call a few days later to come in for a second round of interviews. I have yet to see what that will be like.