You can hear the sound of Nate pulling the hammer back on the revolver multiple times, almost every time he raises the gun, without ever firing.
In this episode it shows Archie has a granddaughter but in a previous episode he mentions his family had grandsons whom he loved dearly, with no mention of a granddaughter.
A literal error in geography can be found on the map Nate has up showing the areas that are being bought up by Latimer. As with many shows and movies, the Upper Peninsula of Michigan is shown incorrectly as part of Wisconsin.