After the boy is injured, Doc Burrage comes over to the McCain ranch. Right before the scene they show the McCain house with heavy smoke coming out of the chimney. But while talking inside there is no fire in the fireplace.
Near the beginning the sign says "Stay off this property or get shot. Abel McDonald". The credits at the end spell his name Abel MacDonald.
After one of Lucas's calves strays onto Abel MacDonald's property, Lucas and Mark go over to pick it up and take it back. Lucas and and Abel get into an argument and then Lucas and Mark leave without the calf they came for.
When Lucas brings a bag of seed over to Abel MacDonald's place he mistakenly refers to MacDonald's son as Gary.