Deliberate mistake: After Elizabeth goes upstairs with the pillowcases for Cindy, in the following shots there are a few long shots of Colonel Brunson's car on the road, and a couple of those shots are flipped - noticeable due to identical trees shown the opposite way. (00:03:55)
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)
Visible crew/equipment: After Colonel Brunson's funeral it cuts to Rose in the living room, and when Elizabeth and Drew walk into the Walton house, the black T-mark is visible on the rug where Elizabeth stands. (00:07:00)
Revealing mistake: While Cindy and Ben are going through Colonel Brunson's belongings Cindy finds the Adoption Decree, and begins reading it. The funny thing is there's a closeup of the document, and it's apparent that it's actually a studio contract. Even without pausing we can read things such as: "Use of Double," "Location Expenses" or "Damage to Wardrobe." Though if it's paused we can read entire lines such as: "Location Expenses: Where the services of the Artist are required to be performed outside of the City of Los Angeles or its environs, the Producer shall transport the Artist and the reasonable personal baggage of the Artist..." (00:08:55)
Factual error: After Cindy admits that she needs to know why she was put up for adoption, when it cuts to a clip of Washington DC with the Washington Monument and Jefferson Memorial in the background, we also see vehicles not appropriate for 1945. (00:14:45)
