Ewing Oil changes buildings in this show to the building with the red sculpture, yet the "Ewing Oil" offices are exactly the same.
When Clayton rides his horse up to the fence to have a confrontation with Ben/Wes/'Jock', there is a camera shot where you see there is sweat in the shape of a Y on the back of his shirt. After the confrontation, when Clayton turns his back, you can see that the sweat stain is now just a straight line down the back of his shirt..