When Roberts comes home from the train trestle job, he hands Gladys a roll of bills. The year is said to be 1917, and payrolls were always paid in specie: gold and silver coin. Paper money was used in factory payrolls in cities because banks were there for the workers to exchange their bills for specie, but for workers on projects in the wilderness, workers were likely to be people living in rural settings who would have been dismayed to be paid in bills. Besides, in 1917 bills were much larger than the ones is shown in Robert and Gladys' house.
It states Robert fished for speckled trout but shows him carrying fish which are very mackerel like. They are saltwater fish.
The narrative claims Robert goes fishing for trouts and he has never seen the sea, despite coming back home with a fresh pair of mackerels. Know your fish.
Robert sees moon landing on a store TV in Spokane - which supposedly happened on July 20th 1969 - but the narrator says that he dies in November of 1968.