My brother in law had two short books on his shelf. One was about your CV &the other about interviews . The interview book said that all questions are really asking 3 meta questions.

1. Can they do the job

2. Will they do the job

3. Will they fit in

I feel that there is also the question of can you manage them.

I've known people who are hard working, popular, brilliant at what they do but you wouldn't let them near the bosses boss!

I think the culture fit is multi tiered. There is the overall culture from top down and there is function specific cultures. If you are a manager the question is how can I recruit an nurture a vibrant culture with out it running riot