The Pin-Up - S7-E17
Stupidity: After Erin leaves with the military captain to Camp Lee, John and Maryellen turn around to see John Curtiss nowhere around on the porch where Maryellen left him. So John goes off to look for him, while Maryellen goes in to check The House. John Curtiss is a one-year-old baby who couldn't open a door.
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.
The Journey - S2-E1
Trivia: While Maggie MacKenzie and John-Boy are at the Mermaid Restaurant, when they both dance together Maggie envisions her long deceased husband, Michael MacKenzie, dancing with her instead of John-Boy. It is Earl Hamner Jr. who portrays Michael MacKenzie in this uncredited onscreen cameo during the scene (note teeth and facial features are identical).