Walked into a half finished CVS and had the interview with the manager in the backroom. There weren't any lights yet, so we had to keep the door open. It felt somewhat casual, until I just started to feel like my answers to his questions weren't satisfying enough. I'm a high school student with no prior experience, he gave me the chance to interview, then told me they were looking for experience. Did they not look at my application? Either way, it was a mess.

Very informal. I suppose it will differ by site. Mostly concerned availability and any past research experience. I found my interviewer to be very easy going and enjoyed the process.