A shot of Uncle Jesse and Skeeter's kitchen shows a bag of C&H (California and Hawaiian) sugar on the shelf. C&H sugar distribution has been almost exclusively west of the Mississippi River. Domino is the longtime sugar of choice in Mississippi, where the story takes place.
When Skeeter goes to blow out the flame on the oil lamp before going to bed, the light in the room goes out, but there's a slight delay before the light coming through the window is brought up.
The license plate on Cash's pickup places the action in 1955, yet when he reads the lost dog ad to Jesse, the magazine he's holding is from the late 1940s.