My process started with a 30-40 minute phone interview with the HR Director. He then asked me to come in to meet with him and the Hiring Manager. The night before the interview, I was told that the Hiring Manager would no longer be able to make it, and I would only be meeting with the HR Director... again. I was in the office with him for almost two hours while he asked me questions that didn't pertain to my job, and was lastly asked to send my transcripts, diplomas, etc. I did.
I was then asked to come in for a second interview with the Hiring Manager and possibly, the VP. Once I got there, the Hiring Manager was in a meeting, so he was late to the interview. They had another person join in, and the HR Director was there.... again. He made sure to ask me about my transcript, and I reminded him that I sent him a copy. He then asked me whether my 4.0 in grad school was on a 4 point scale. I've never heard of a university using anything different, and I would have thought that an HR Director would know that. I was in the interview for about an hour and a half. The number of questions I was asked that actually pertained to what I do: probably about 5. Number of questions that had absolutely nothing to do with my actual job: 100. And when I say had nothing to do with my actual job or tasks performed, I was asked things like who led other departments and how other teams did their work.... in previous companies.
I was also asked to get up and draw a process from several positions ago. 1. It was a long time ago, so I don't remember. 2. Even if I did remember, it's proprietary information that's none of Circle K's business. After talking about my past project management experience for an hour and 15 minutes, the VP told me he didn't think I did any Project Management work until my current role that I've only had for a little over a year. I'm a PMP, by the way, and I got it years ago. I was finally given the opportunity to ask questions, only to be cut off because the VP had to leave, and was told to just email them. Never did. A part of me felt harassed, and the other part of me wondered why I left my current job early that day, because I had just wasted an hour and a half of my life. There is no amount of money that would have ever made me work for this company. I was very happy when they sent me a rejection email.
To prepare for interviews with this company, make sure to research every department in every job you've ever had, as well as every nitty gritty details about people you used to work with. Don't worry about talking about your actual work or accomplishments. It won't help you.