Comcast Senior Project Manager interview questions

Interview was in 4 stages: (1) a prescreening process by the recruiter, (2) a preliminary 30 min interview by the hiring manager, (3) a 4 hr panel interview by the hiring manager and 2 direct reports, (4) a 30 min interview by the hiring manager's supervisor. The panel interview required a case study presentation that I was given 2-3 days to prepare and 30 minutes to present in front of a panel of 4-6 employees. Before the final stage of the interview process, I was asked to submit 3 references, and attended a product demo. Unfortunately, Comcast did not contact my references, and did not provide feedback on why I was not offered a position.