(Note: Interview was yesterday morning, but I'm pretty sure I'm not getting the job)
I read the other posts here and felt pretty confident before getting to the interview. I'd say it lasted about half an hour. All of the interviews were conducted on the sales floor, and I was taken into the Children's section. The interviewer asked me about myself first; whether I consider myself a "successful" person, etc. I didn't want to digress at any point, so I just said the most relevant things to the Logistics Associate position. I said I was neat and brought up the whole "good attention to detail" thing. So, she asked me how many mistakes I could notice in the product displays around us and then asked me what I would start working on if I was thrown into that section without any instructions and how I would manage if there were clients. I felt kind of trapped, because I didn't want to insinuate that their employees weren't doing a good job, but, whatever...I guess that's why they're interviewing in the first place. She asked me about working in groups, most recent work experience, about my personal style (for which I gave a terrible answer), what I thought the trends would be next season (study the website, guys!!!), who I thought their biggest competitors are... One of the first questions was actually their date of establishment. I do not how I got that right...(1994). I got asked about best and worst customer experiences, and I went blank for a moment. The hardest part was at the end, when she handed me an Old Navy Card brochure and left me alone for a while to study it. Then I had to "sell" it to her, pretending that we were at the cash register. I really sucked at it. So nervous.
Anyways...I'm surprised at how many questions there actually were. I recommend that you over-prepare, and think of customer experience stories, describing your personal style and inform yourself about the store. I already knew this and my interviewer told me this herself as well, but you should know that Gap and Banana Republic belong to the same chain as Old Navy, as well as the online stores Piperlime and Athleta, so DON'T mention Gap as one of ON's competitors!
Good luck!