When Verdie got on the bus to Richmond she sat down in the front seat. This was Virginia before the civil rights movement. Black people had to sit in the back of the bus. It was long before Rosa Parks made her historic refusal to give up her seat in the front of the bus.
At 8:15, a framed Confederate flag is seen hanging on the wall of the classroom. Even though the show is set in 1930s Virginia, this would have been highly unlikely. For several decades after the Civil War, the Confederate battle emblem was rarely displayed in the south, and it was not part of state flags (the sole exception being Mississippi) or other official symbols or displays.
In the opening credits for this episode on the DVD, modern-day telephone poles and electrical power towers can be seen in the background as the camera pans over to the Walton house.