In the episode where Opie is not allowed at the jail anymore he leaves home kicking a can, goes past an old mine and winds up exchanging his can to another kid for some apples. As Opie is sitting on the back of the pickup truck eating the apples you can see a cabin in the background with a window on the side. As the camera is rolling you can see a reflection of a man walking past in the window but there is no one there. I am not sure how this happened unless there were two takes spliced together or there was a ghost on the scene.