Factual error: "Underground" is set in 1857 Georgia, yet the padded baseball glove August Pullman gives to his son is of a type used during the early 20th century. Before 1883 when padded gloves were first manufactured, gloves were either not used by baseball players or railroad brakeman's gloves were used.
Underground (2016)
1 factual error in show generally
The Macon 7 - S1-E1
Continuity mistake: At the party, Suzanna Macon passes her tea cup and saucer to a servant twice.