Other mistake: While John and his sons are at the pig pen talking about Rover, in the first wideshot facing them all we can see the Baldwins' stationary car parked near the pen, waiting for the cue to move at the proper time. During their entire conversation nobody remarks or reacts to the Baldwins' car being right there, not until the second wideshot, just as the vehicle moves closer to the Walton house, and then everyone exclaims, "Baldwin sisters/ladies!" as if they just now showed up. (00:03:55)
Visible crew/equipment: While driving to the fair John-Boy tells Oscar it's the next turn on the right, then it cuts to two overhead shots of the fairgrounds, and in that second overhead shot we can see the crew's Panavision camera at the bottom right corner of the screen. As an aside, Panavision was founded in 1953. (00:28:40)
Visible crew/equipment: When Oscar and the Baldwin sisters get up to leave after their visit with the Walton family, they walk to the front door and we can see set equipment at the right side of the screen. Then when they get into the vehicle and start to drive away, the reflections of some crew members are visible on the vehicle windows. (00:10:20)
Factual error: The Woman talking with Mamie and Emily about the jams is wearing 1970s large framed glasses. (00:33:15)