Corrected entry: The General's daughter is leaving the formal occasion in her dress uniform. It is highly unlikely that someone would be driving a dirty tactical vehicle in the most expensive clothes that they would ever own. In addition, she pulls a tire iron from the hummer to assist Travolta. Hummers do not have spare tires. They are equipped with run flat tires, so would have no need to carry a tire iron. And those lug nuts won't budge without an impact wrench.
Corrected entry: John Travolta's character (et al.) salute early in the morning (before sunup) while a bugler plays "reveille". The bugler should have been playing "colors". Unless the Army is completely different from the Navy, Old Glory is hoisted up the flagpole at 8:00am, at which time the sun would have been up anywhere in the continental U.S.