I was called in by the department manager after a few weeks of applying. The interview was casual and all that happened was she took me into her office, she explained the job to me and took me on a tour to see the deli area. The questions asked, which were in a casual format were "Tell me about yourself?" "Why do you want to work for Walmart?" I showed up in professional, business casual clothing with a well versed and formatted resume which they were impressed by.