The first one is especially important, I find. When I ask the question, "What do you dislike most about your job?" or "If there was one thing you could change about the work environment?", I expect an interviewer to have an immediate answer prepared. If they don't, I assume that they either lack critical thinking skills and are unable to independently drive change or are expected to just follow orders. I don't have any desire to work at a company where management does not respect input from employees and employees are not encouraged to think about how things could be improved.