When John-Boy is in his bedroom, trying to come up with the right word for his writing. His grandmother comes in and asks if he is ok. The camera cuts over to him and there is some type of lamp in the far right side of the shot. The camera cuts back to the grandmother and then back to John-Boy. When it does, the lamp is not there.
When John Boy speaks to his father at the kitchen sink, there is a long string hanging from the ceiling next to him, and no blinds or light fixtures to explain its presence.
At 37:00 into the episode the shot has obviously been flipped as it shows the steering wheel on the right hand side of the car.
Opening narration for season one states it is 1933, but the picture show John-Boy and Sarah go to is 1935's Forbidden Heaven starring Charles Farrell.
When John Boy and Sarah are sitting in back of the truck, riding back from the picture show, there is a man in sunglasses to the left of the screen, and appears to be riding along on the outside of the truck.
Earlier in the season, the children were separated by age for their classes (though Miss Hunter appeared to be the teacher for all of them.) Now they are suddenly all sitting in the same room.