At 39:35 Olivia is seen using the washing machine that wasn't given to her until the following episode, The Reunion (1972).
When John Boy and Jason are at Ike's store, they were planning to buy canned peaches, but put them back because they didn't have the money. Olivia and Mary Ellen are then seen in the Walton kitchen cooking peaches and putting them into mason jars. There was no need to buy the peaches if they were making their own at home.
When John Walton and Ham Denby are in the dark and John is fixing Ham's engine, Ham says how nice to have land handed to you on a silver platter and others have nothing. John says 'Well Vanders' instead of his character name, Ham. Warren Vanders is the actor who plays Ham.