I had 3 calls. The first was with the recruiter, and the 2nd and third were with current PMs, and they focused on making sure you understood the responsibilities of a PM and knew what to do in certain situations, discussing previous work experience, etc. Then I went in for a set of in-person interviews (I believe 5 in total), and they ended up focusing mostly on making sure you fit the company culture (i.e. really smart and really friendly) rather than how to be a PM. Make sure you always have great, relevant questions to ask, because a lot of the time is spent actually asking them questions. The entire experience was really phenomenal, and I definitely understand why people absolutely love working there.