It didn't feel like an interview, it felt more like having a conversation with someone and talking a bit about books. They will ask mostly behavioral questions and customer focused questions

I had a negative experience with the staff at Waterstone's. They asked me rapid-fire questions and seemed to take issue with the fact that I am an immigrant. They were quite rude throughout the interaction. The final straw was when they asked me three questions at once, not allowing me to finish my responses. However, I am relieved that I did not receive an offer, as I do not wish to work with people like that.

Very smooth interview, had an hour or so long conversation with a very lovely person who was genuinely interested in my love for books and the publishing industry. I felt completely at ease and able to respond to all questions asked. Of course, some of the questions were directly related to the job, but a bit of preparation beforehand was enough for me to answer them satisfactorily.