Mark's hair
I'm sure it will be a great movie. Just a quick complaint after watching the trailer. Wahlberg's hair is too long and shaggy to be a uniformed police officer.
Police departments have grooming regulations and his hair is too long around the ears and around the collar. Such a simple, avoidable error which detracts from authenticity. Why didn't Peter Berg simply require Mark to have a standard high and tight haircut?