The newlyweds' shed should not have needed curtains. Mary Ellen already hung printed curtains in there back before it was John-Boy's office for the printing press.
Cindy has a turntable for 45 rpm records. The 45 was not in use until 1949. This episode takes place in 1942.
After Ike tells Corabeth about Ben getting married, Corabeth goes over to the phone, picks up the earpiece, and starts talking to Miss Fannie. However, she didn't crank the phone to call the operator.