When Billy Young goes to capture the donkey to ride, he takes off his belt to use on the animal. But when he is seen riding the donkey, he has a rope tied as a bridle and his serape has somehow been placed on the donkey's back as a blanket.
During the attempted stagecoach robbery, Kane (Robert Mitchum) puts down the rifle he's firing, apparently out of bullets, and starts shooting with his hand gun. But in the last scene of the stagecoach leaving, he's shooting with his rifle again.
As Billy watches Kane ride away with Lily, he grasps his belt. In the final shot, he watches the stage leave with his arms at his sides.
When Ben Kane knocks out Billy Young in the jail house and makes a break through the gunfire for the corral, the 4 horses in the corral get spooked and break down the corral fence and run off. Moments later, a stagecoach shows up and hightails it by the corral, and the horses are back in the corral.
Billy is soaking wet from the rainstorm when he enters Lily's shack. As he warms up by the fireplace and talks to Lily, his cowboy hat alternates between being wet to dry and back to wet again.
When Billy Young attempts to capture the donkey, the stuntman is obvious due to darker and shorter hair than Robert Walker.
In the confrontation between Kane (Robert Mitchum) and Frank Boone (John Anderson), Kane positions himself atop Charlie's (Paul Fix) stagecoach. When Kane shoots Boone there's a quick cut to Boone lying on the ground. When the camera comes back to the coach, Kane is sitting next to Charlie, but after another quick cutaway, Kane is back on top of the coach.
When Deputy Kane was on the stagecoach as it was attacked by robbers, he shot the first one, who fell and was dragged by his horse. When he hit the ground, his pistol was in the holster, even though he was just firing it when he was shot.
In close-ups of the top of the locomotive, the wires holding the prop smokestack in place are visible.
Lily was on stage and Kane went in the back to find her room. He opened the first door to his right and it was occupied. He went to the next room to his right and went in. A minute later, Lily came in through a set of curtains on the right wall, which was the common wall between her room and the one that Kane went into by mistake just a minute before.
Shadows are cast onto the sky portion of the backdrop with cactus seen outside the saloon doors at the end when the Sheriff exits.
The train locomotive is obviously of twentieth century construction. It has a steel cab, tender type, piston design and rod arrangement not available until the early 1900s.
Around 1:45, as the locomotive chugs into the foreground, a modern high-voltage electric tower is visible on the hill in the background (just to the right of the black smoke), for about 10 seconds.
At the beginning of the movie, when the train is going down the tracks, a train whistle sounds. However, no steam comes from the train's whistle, just the black smoke from its smokestack. This is obviously an added-in sound effect.
When Jesse Boone (David Carradine) and Billy Young (Robert Walker) jump their horses off the flatbed train car, Billy is flogging his horse with his rifle barrel and you can see the rifle flex. It's obviously a rubber stage prop.