Other mistake: When Jim-Bob comes home unexpectedly while Drew is over, this scene takes place in the boys' bedroom. In the interior shot, when Jim-Bob tells Drew to douse the light Drew gets up and turns off the light in the boys' bedroom, then it cuts to the exterior shot which specifically shows their window going dark as the light is being turned off by Drew. The problem is in this exterior shot we are seeing the light go out in John-Boy's bedroom (where Mary Ellen resides with the baby), not the boys' bedroom. (00:26:00)
Other mistake: The Walton boys are in the military. None of them have military haircuts.
Other mistake: When Elizabeth's horse takes the bad fall, Maryellen tells them it has a broken hoof. So they put the horse down instead of taking it to a nearby vet for help.
Suggested correction: This episode takes place in 1945. We see Mary Ellen look toward the mare's front (not hind) legs/joints, which are weight bearing; and when Mary Ellen tells Elizabeth about her mare, Molly, Mary Ellen's actual words are, "Elizabeth, it's her leg. It's broken. It's bad. We're gonna have to put her out of her misery." Viewers are not shown what Molly's "bad" break is, but with Mary Ellen's words, we know the break is severe, which was a death sentence for any horse. Just to add, it all completely depends on the location of the equine injury and the severity of the break/fracture. Nowadays, with modern advancements in equine veterinary care, (thankfully!) some severe breaks may not be a death sentence for a horse.