Joel McCrea was wearing a yellow vest talking outside saloon with two buddies. When they entered the saloon seconds later, he was not wearing vest.When he eventually leaves the saloon he walks towards the door and is next seen by his horse and is then wearing his yellow waistcoat again.
During the first night of the cattle drive, Cord and Ralph have a conversation on horseback in which Cord tells Ralph that the moon is coming up. But the previous scene showed a brightly lit night sky, as if the moon were already high in the sky.
At the start of the movie as John Cord is lying in the street after being dragged around, the Hamiltons walk up to see what is going on. When the view cuts to close ups of Cord in the street, you can clearly see the green dress of Janice Hamilton right next to Cord. Yet when they go to pick him up, they have to walk several yards to where he is.
At 54.00 minutes into the film, the cowboys are sitting around a campfire and the character referred to as 'Wrangler' asks one of the Vaqueros for 'aqua', Spanish for water. The Vaquero picks up the coffee pot and pours coffee into his cup.