US Army troops escort a gold train of horses carrying large wooden boxes prominently marked 'U.S. Mint Washington D.C.', advertising the contents in hostile territory to any malefactor who might be interested. Although, the U.S. Mint is headquartered in Washington D.C., it is not a production facility for either gold coins or gold bullion. The boxes are much too large to be carried by horses if they actually contained gold, but are obviously empty the way they bounce up and down on the horses when they are run off in the ambush.
In the final fight scene between Clint and Brady, Brady is restrained by the Indians and the shot shows his left hand is in front of him. However, in the next shot from behind, both of his hands are tied behind his back. When the shot returns to the front view he has a rope wrapped around his chest which was not seen from the rear view.
Part of the raiders fall back to guard the entrance to the canyon whilst the rest remove the brush blocking their path. When the posse arrives, one raider is shot and falls behind the prone raiders. He has a pink shirt, black jacket and cowboy hat. The same raider gets up and is shot again later in the sequence after the lead raiders are shown.
The Rangers and soldiers are chasing the raiders down a dirt road after the gold robbery. Fresh tire tracks left by the camera car preceding the chase group are clearly visible under the hooves of the galloping horses.
The film moves from Texas to Arizona in 1866. The first town mentioned is Tombstone. Tombstone wasn't founded until 1879, two years after Ed Scheifflin made the silver strike that named the town and 13 years after the period in which the film is set.
In several scenes set in 1865 and 1866, cavalry carry a highly unusual guidon - a fork-tailed flag carried by each company in the US army. In western movies the most common type of cavalry guidon is the 1864 to 1862 pattern, red above and white below, with white letters "U.S." above, and the red company letter below. The second most popular type of cavalry guidon in westerns is the pattern used from 1885 to the res present, red above and white below, with the regimental number in white above and the company letter in red below. A very distant third most common type of guidon in western movies is the type actually used from 1862 to 1885, with the stars and stripes on the fork-tailed flag.
But the guidon seen in Arizona Raiders is not any type ever carried by the US cavalry. It is all black or dark blue with hard to see designs in a lighter color. In one scene the number "18" is glimpsed on the guidon, implying the soldiers are in the 18th US Cavalry.
But the modern US infantry uses dark blue guidons with the crossed rifles of the infantry branch and the regimental number above and the company letter below, all in white.
Thus it seems likely that the props person making Arizona Raiders either acquired a guidon of the 18th US Infantry or else had served in the infantry and thought that cavalry guidons looked like infantry guidons.
Shortly after Audie Murphy's character is induced to join the Arizona Rangers he meets up with his kid brother at a watering hole where several very obviously plastic or fiberglass saguaros are uncharacteristically 'growing' at the water's edge. Only 6 feet tall, they are multi-branched, something that would not happen until the cactus was much older and many times that size. Shot at Old Tucson Studios just outside the boundaries of Saguaro National Park West with Tucson Mountains rising in the background, there are many real saguaros in the immediate vicinity which dwarf the bright green fakes.