Poorly managed interview process. Personally, this was the most poorly managed interview process in 10 years of my professional career.
1. Two of the interviewers had limited experience in product management. One of the PM interviewer was arrogant and got upset when I questioned his hypothesis. He was not aware about the position I was interviewing for. Poor selection of interview panel.
2. I was asked to create a presentation which required 10-20 hours of work. The presentation was cancelled later.