Unorganized interview arrangement - interview time adjusted multiple times
Weird interview - Wasted time by asking low-level questions that weren't really related to the post and could easily be answered by simply looking at my resume. Also, no QA session at the end of the interview
Unprofessional HR practice post-interview - Figured out that the result was out, but HR did not want to reveal the decision when I made the inquiry. Was that hard to say a "No"?