Ben is shown selling the Saturday Evening Post. The magazine he pulls from his bag is the March 12, 1938, issue, published about four years after the action of Season 2 episodes.
At 11:20, Richard Thomas appears to have mistakenly left a prop in the truck after Ralph Waite says the line, "The part come in, son?" Thomas ad-libs, "Oh yeah, I forgot it," retrieves the prop and continues on with the scene.