After Conagher fights Chris in the bar, he puts on his Gunbelt twice.
When Conagher catches up to Tile Coker and the other rustlers, and flushes them out of the cabin, the amount of blood changes on the man that gets shot in the shoulder.
The stagecoach driver says they are going to Lamesa, pronouncing it as "la maysa". Actor Barry Corbin, who is from the Texas panhandle, knows the town well and is aware that it is actually pronounced "la meesa". This was obviously due to the director.
The ports in the windows are too high. At that height they are fine for an erect adult to see through but could only be used as gun ports if they were at shoulder-height.
Near the end when Connagher gets shot at and he hides on the mountain cliff, there is clearly the sound of a helicopter in the background.
In the credits Ted White is listed as "Stage Passenger," but Ted White, with a long history of stunts and supporting characters, is clearly Jackson, one of Smoke Parnell's riders.
When Conagher leaves the Teay ranch, he says he will be back in the spring following the wild geese. He heads north to Evie Teale's place. The wild geese would not be heading south in the spring but would be heading back up north.
When Evie Teale's husband is trapped under his horse he draws his revolver. When he does so, a white tennis shoe is visible in the lower left of the frame.
When Conagher first meets Tile Coker, you can see the shadow of a boom mic on the ground next to Conagher's horse as he rides up to Tile.