One of the goofs is wrong
A good listed as being an anachronism is incorrect. The goof says the flag has 5 lines of 7 stars, 35 total, putting the timing of the movie during the Civil War. This is not right. The flag had 3 lines of 7 stars, and 2 lines of 8 stars. You can see this during Thursday's charge, when the flag is streaming back. 38 stars puts it somewhere between 1876 and 1889.
By the way, this is still a problem because Cochise died in 1874.
I asked the doctor to take your picture so I can look at you from inside as well.