At about 6 minutes in, David is talking to a military member. He leans in close to read her badge and calls her "Private". She is wearing an Air Force uniform (blue) and there is no Air Force rank of 'private'. Furthermore, the rank insignia on her shoulders is that of a Captain, and would be Captain even if she were wearing the green dress uniform of the Army instead of the Air Force. This mistake may be character error, as David, unable to figure out her rank simply calls her "Private" out of ignorance.