Josh is painting a low board when he talks to Jeffrey, in the next shot it jumps up to a high board.
At the beginning, the trailing arbutus is missing from the column to the right of the Waltons' front door. At 25:11 the arbutus is back.
When Jason checks the soldier who makes fun of Ben, he tells him to set his cap at the proper angle, and to button the button on his blouse. The soldier straightens his cap, but doesn't button the blouse button before he walks away.
The sweeping sounds of Josh and Jeffrey's paintbrushes do not match their actions.