Someone once told me to ask this at the end of any interviews; "Is there anything giving you doubts about my suitability for the role, if so, what are those doubts?"
It gives you a chance to be told any such doubts while you're still there and able to defend yourself as such and reassure the interviewers why they needn't have such doubts. I've been told a couple times now by interviewers what a great question it is.
But my biggest bit of advice is to just be yourself, let them see your personality so they can see how you'd fit in with the existing team, not just learn if your skills are a match. Good luck, and remember what's meant to be will be.