The novel on which this telefilm was based, 'Young Pioneers' was written by Rose Wilder Lane, the daughter of Laura Ingalls Wilder, who wrote the books on which La petite maison dans la prairie (1974) was based.
The family is accurately shown living in a sod house, as wood was scarce and expensive.
Most sod houses are gone.
There is a museum in Aline, Oklahoma that has an original sod house. Worth a look if you want to see how rough prairie life was in those days.