Other mistake: When Erin leaves The House to go with Ashley Jr., Elizabeth states to the kid that it's 3 a.m. When Ashley stops The Car to propose to Erin moments later, it is sunrise between the trees or early daylight, meaning this was a moment shot in different increments.
The Waltons (1972)
1 other mistake in The Lost Sheep
Starring: Eric Scott, Jon Walmsley, Judy Norton, Mary Beth McDonough
Visible crew/equipment: At the mill, when John tells Buck that Willie Brimmer might be at the Montgomery cabin with Jim-Bob, in the next closeup of John we see a billowy trail of cigarette smoke at the bottom right corner of the screen, but the only people standing there are Elizabeth, John, and Buck, and none are smoking. Presumably, it was someone offscreen smoking too close to the camera (similar to a mistake in 1978's "Halloween"). (00:26:05)
Olivia: Now I've got two sons working nights in a saloon.
Trivia: While John is reading the newspaper funnies to John Curtis, we hear Erin and Mary Ellen come home, so John puts the folded newspaper down on the couch. And as the newspaper lies on the couch, we can see the large white adhesive label with typewritten sentences adhered to the center of the funnies page. Presumably, these are the actor's lines as he was reading quite animatedly to the toddler (sweet moment). (00:06:25)