Near the 68 min mark, no one would have 3 candles and an oil lamp burning in daytime.
The first telephone exchange was not until 1881 in Arizona territory. This film states it starts out in 1879 Arizona territory, so the telephone would not have been there yet.
At the 68 min mark there is a wall clock with its pendulum stopped.
When Michael and Angel are gathering their guns and ammo after they have decided to help the two women, and the shot zooms in and shows the rounds cascading to the table in slow-motion, none of the rounds have primers.
Around the 19 minute mark a vehicle can be seen driving down the road in the distance.
Makes no sense that they turned two spare horses loose that could have been sold for extra cash or bullets.
Kara is a simpering idiot.
Nobody in the history of the US ever said the word 'pard'.