you're guaranteed to get a question on ethics. i had very formal and extremely informal interviews and ethical dilemma scenarios always come up. make sure you give the answer that they want to hear.
ethics to schools and administrations is huge and we had tons of ethics classes the first 2 years of dental school. i always found it ironic though because i don't think someone can be taught how to behave ethically. if someone hasn't figured it out by the time they're in dental school, they probably won't.