First to Thine Own Self - S2-E20
Factual error: Randy sings I'm So Lonesome I could Cry by Hank Williams, who didn't write it until 1949.
The Virginian (1962)
1 factual error in season 2
Starring: Lee J. Cobb, Doug McClure, James Drury, Sara Lane
Genres: Western
The Return of Golden Tom - S4-E25
Factual error: The Tedlers' kitchen is a 19th Century redress of a 20th Century set, but still includes a modern sink and faucet fixture where a water pump should be.