When Iris Crowe kneels by Rev. Norman Balthus' bed, you can see the elastic of the fitted bottom sheet. Fitted bed sheets were not invented until 1959.
No part of this episode takes place in UT (Utah). The sign posts throughout show that Ben and the rest of the Carnivale crew are always east of Cheyenne. The Lincoln Highway did go through Utah but it wasn't the only place it ran.