The Carnival - S1-E3
Revealing mistake: When Jonboy, Jason, Ben, and Elizabeth are trying to lure the monkey down from the tree, the leash it's tethered to is visible down the tree trunk. But then disappears after the monkey climbs down.
Revealing mistake: When Maryellen runs into John-Boy's arms (after running away) Richard Thomas (John-Boy) breaks character as he looks into Judy's (Maryellen) eyes, by swallowing hard. Like a guy would do, when he's close to an attractive girl. Then later covers his groin with the cast, when John and the kids check up on him. The two young actors playing Jon-boy and Maryellen crushed on each other behind the scenes.
Revealing mistake: When John Boy goes out of the kitchen angrily, the view of the back is different than what it actually is. From the kitchen, there appears to be the mountain and trees, but when John Boy is outside leaving the kitchen, we know the barn is what we should see from the back door/window.
Revealing mistake: Throughout most of the episode, The Car is a standard black with chrome trimming. But at the end it's suddenly beige when Johnboy and the kids are polishing it for their first ride.
Suggested correction: At the end it's not "suddenly beige." Mid-episode Mary Ellen mentions a family project to, "Design you a new-looking car" and Erin adds, "We can paint it." Soon John-Boy says, "I'd like to paint it a nice dignified shade of tan." In the penultimate scene John-Boy drives Hyder and Martha Rudge back home. Time passes offscreen. It cuts to the final scene with Mary Ellen and Erin placing their new cut/sewn seat covers in the newly painted tan car, and nobody is "polishing it for their first ride."
The Fighter - S4-E3
Revealing mistake: The Woman spectator at the boxing match is wearing an obvious 1970s fashionable floppy sun hat and dress, instead of an appropriate 1930s style.
Revealing mistake: The wall in Jon-boy's room 'jiggles' a bit as Erin is confiding in Jon-boy about Maryellen, indicating it's either a set piece or an office partition instead of an exterior wall.
Revealing mistake: When John Boy and the others are watching the movie being shot, a helicopter can be heard. This takes place in 1936 with The Abdication of Edward VIII, and there would be no helicopters around at that time. (00:25:20)
Revealing mistake: Her scalp 'shifts' slightly when Olivia fusses with her curly 'do, indicating it's an obvious wig.
Revealing mistake: While John-Boy is in his old bedroom with John Curtis, having a heart-to-heart conversation with the baby, in all the wideshots from behind the crib the edge of the set is visible at the right side of the screen. (00:21:20)
Revealing mistake: During the drive up the mountain for Zeb's birthday, while John and Olivia talk about the co-op offer, the edge of the rear-projection screen is visible over the vehicle's roof, at the left side of the screen. (01:26:15)
The Calling - S7-E2
Revealing mistake: While Mary Frances and Jim-Bob are flying the Cody kite with Sister Scolastica there's an overhead shot from behind the kite, and the lower string goes off toward the right even though the teens are to the left, and the kite is also being held up by a wire at the top which leads off screen. (00:36:05)
The Home Front: Part 1 - S8-E1
Revealing mistake: At the start, while John and Olivia are in the vehicle driving home, the edge of the rear projection screen is visible at both the left and right sides of the screen. (00:02:45)
Revealing mistake: When Anna Mae appears at the bedroom doorway John sees the cute quiet girl, then as John walks toward her he passes the dresser's mirror, and we can see in the reflection the end of the set wall behind him. (00:14:30)
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)
The Hot Rod - S9-E12
Revealing mistake: When John-Boy, Mary Ellen, and Verdie are bringing Jody home from the hospital, during the drive in the two shots facing the front of the vehicle, the edge of the rear projection screen is visible at the left side of the screen. (00:45:25)
Revealing mistake: While Erin and Paul are driving to his home, when Paul tells Erin that he lives about half an hour up the road, from this moment until the end of this scene we can see the edge of the rear projection screen, at the left side of the screen. (00:31:50)