Right out of the gate, under the narrator's opening statement "It's the early 1930s," along a picturesque stretch of wintry wooded 2-lane blacktop rolls past a black car from at least the late 1940s.
In a dismal - & slightly "augmented" with an extra word - of the same cultural screwup as was scripted in "Best Served Cold" (S1 E2, 2019), Herman Lay is depicted, quite gracelessly, saying to the newly widowed Mrs. Barrett, "I'm *very* sorry for your loss." This is a latter-day devolution in the terminology of expressing sympathy; even though these people were across the socioeconomic divide from Marjorie Merriweather Post, to whom it was said in the earlier episode, still this cookie cutter statement did not exist in those days.
While on the phone with the Quartermaster in 1942, Charles Doolin is shown using what appears to be a Parker Jotter pen. That pen was not launched until 1954.
When Herman Lay stands up to shake C. E. Doolin's hand to begin their salty snacks love affair, a profile closeup shows he has a pierced left earlobe. The corporate suit crews of that time did not indulge in such accessories - publicly visible.