I found about this job internally, but it was also posted on craigslist and on gap's public career website. It was a week from when I submitted my resume to when I interviewed.
The interviewer wanted to hear about my scheduling ability, and specifically to hear stories about challenging experiences. Also, they wanted to hear how much I loved working at the Gap, and how I believed this position was perfect for me - that was important! Show a lot of enthusiasm, and show no doubt that you'd love the position more than any other you could pursue.