When Mary asks Frank and Jesse James what they know about the Civil War, Frank says they fought in it. This is accurate, as the real Frank and Jesse James had fought for the Confederate States of America during the United States of America Civil War.
Three famous outlaws are portrayed in this episode. Frank and Jesse James, famous bank robbers; and Robert Ford, the man credited as killing Jesse James.
The "Rule 11" that Frank tells Mary about and that Bob Ford calls a lie prompting Ms. Beadle to correct him on is in actuality "Union Army General Order 11 of 1863" and says exactly what was indicated in the episode.
On September 7, 1876, Frank and Jesse James robbed the First National Bank in Northfield, Minnesota, which is approximately 125 miles east of Walnut Grove. In the weeks that followed, the pursuit of the bank robbers covered 400 miles.