In my previous position, I wasn't on the committee, per se, but gave an operational tour to each candidate and tried to explain what we did and our job functions. One candidate didn't seem to pay much attention and was eliminated because he wanted too much money. Another candidate thought he knew more than I did about our operations since he had glanced at our website and walked around the building before the interview. The third candidate was able to understand what I was saying to him and asked good questions about what we did. This casual back and forth was helpful in assessing his demeanor and grasp of technology. He was a manager, so he wasn't actively managing servers and such, but knew what I was talking about and not just buzzwords. I was able to recommend him to the committee and I left his department seven years later with a good reference.
Things that stand out to me about people, especially managers: proper dress, profanity during the conversation, excessive sarcasm, and any hints of poor anger management. I may be old school, but I want a manager that doesn't yell or swear at me during our interactions and isn't sarcastic.