When Beau is 'kidnapped' he has no hat, yet when the three riders are seem in the next shot they each have a hat. When they arrive back at the fort, Beau has no hat again.
Flour does not get maggots. It gets weevils. Flour is too dry and lacks the nourishment flies/maggots are attracted too. Flies are carrion feeders.
Plains Indians don't worship totems. And totem poles were traditional in the Pacific Northwest, British Columbia, and Alaska.
Miguel Angel Landa's character is listed as "Swift River" in the end credits. However,, all on-screen dialogue refers to his character as "Swift Wolf".
Beau is told to escape by heading south-west. In the next shot an Indian chief says his son's killer would ride from the south-west. If Beau was riding towards the SW, he would have been coming from the north-east.