The process was completely broken. I was contacted by a number of recruiters from Apple, who redirected me to other recruiters and so on. Finally, I was invited to an onsite interview session and was interviewed by a few people. Some of them were quite knowledgeable, and it was a pleasure to talk with them. However, a few of them (I wouldn't say stupid) weren't, and they asked questions completely unrelated to the position. At that point, I understood it was a failed attempt. About 1.5 weeks later, I asked for an update from the recruiter and received a reply that I was kind of over-experienced or at a higher level than they had expected.

Didn't get any difficult questions.