It probably won't matter unless you are the type of person who "hides" behind their hair. If you have a tendancy to do this, I would pull them back so that you are unable to. If you are unsure if you do this, ask a friend or your parents. Having interviewed hundreds of people in another industry, I can tell you that this is more common than you might think and definitely reveals when someone is very shy, trying to hide something or just plain lacks confidence. Body language can play a big part in interviews.