Other mistake: In one of the final scenes where Maverick is having a bath/sauna, enjoying his victory, you see a man walk past with only a towel on. As the man climbs the stairs, his towel opens a little bit and you could see he is wearing white underwear or briefs. In those times that kind of underwear did not exist.
Other mistake: During the scene when the trio is attempting to rescue the mission women's money, Maverick goes on a rant on how he is outmatched in bullets when set up against the thieves. He complains that he only has six, so he takes Ms. Bransford's gun as well, yet when the shooting finally begins, he fires about fourteen shots from his six-shooter before pulling out his second gun.