The scar on Sadie's cheek keeps changing severity and size. There is a very noticeable difference, for example, in the width and scar tissue detail at 31 minutes compared to 47 minutes,
As in a previous episode, the phone booth Jake uses has no visible above-ground wires or connections as there should have been in 1963.
When Jake gets beaten up in the alley, his face is badly damaged and bloody, but his white shirt is still perfectly clean.
Despite all the vintage cars on the street, and the 60s appearance of the neighborhoods, there is modern Cable TV facilities as they pan down to street level in several scenes.
The classical music playing in the background of the scene where Harvey meets his wife (mins 4-5) is Bach's Brandenburg Concerto as conducted by Karl Richter. But it wasn't produced until 1967, four years after the time when the episode takes place.
While Jake is observing Bill and Lee on the porch handling Lee's rifle, a VW bus parked behind Jake is visible. Based on the headlight styling, this is a 1968 or later model. Headlights on 1967 and earlier had a glass bubble enclosure, while 1968 and later models lost the glass bubble, and adopted a simple vertical headlight with a chrome rim.
Sadie jokingly asks Jake whether pantyhose will ever become comfortable in the future. But women did not commonly wear them in 1963.