Lighting Control Embedded Systems Engineer interview questions

Phone interview with HR Panel interview (phone) with hiring manager, two other managers, general manager + HR Half-day on-site/ in-person interview with various managers, included personality, skills, IQ test. Follow-up phone interview with VP in HQ. People overall were courteous and open. All seemed dedicated, passionate about what they do. However I got the impression (expressed clearly by hiring manager and even the higher-ups); not sure what would have held them back from making an offer... oh well, I found them to be good people.