After Sullivan's last words he slumps sideways with his head on his outstretched right arm. There's a close up of Audie then a long shot as he picks up up Sullivan's cigars. Sullivan is now seen lying on his back so as to make it easy for Murphy to put the cigars in Sullivan's pocket.
When Jones (Audie Murphy) breaks the knife in half at Flood's (Barry Sullivan) cabin, he would have made the broken edge jagged and sharper than if he had left it alone.
Seven Jones (Audie Murphy) clearly shoots Jim Flood (Barry Sullivan) off his horse from behind, but Flood's bullet wound winds up in the front of his left shoulder.
When Jim Flood awakens in the bunk-bed after Jones removed the bullet, a wingnut can be seen as part of the frame of the bunk-bed.
Big Lake is said, in the saloon scene, to be north of Sterling, Texas. In fact, it is southwest of Sterling.