During the climactic gunfight where rider Rod Lacy is himself chased on horseback by the marshal and both then dismount to continue shooting at each other, Lacy astonishingly manages to fire 11 shots from what is clearly a revolver pistol (which normally fires only 6) before an attempted 12th shot reveals it to be out of ammunition, and only then is Lacy forced to reload it - he is out of frame briefly whilst on his galloping horse (the camera cuts to the chasing marshal) but could not have conceivably re-loaded during that very short time, and at no point throughout is he shown to be carrying 2 guns.
At the film's climax, Gerald Mohr's six-shooter fires at least ten times before he finally reloads.
When we first meet Marshal Lightning Tyrone and his father, the tracks of the camera dolly are clearly visible as they walk through the town's main street.
With Audie Murphy at 5ft 5in (1.65m) and Susan Cabot at 5ft 2in (1.57m), the seeming difference in their height of between 6 and 8 inches (15 to 20cm) in every scene the two share is obviously a movie production trick.