According to David X. Cohen, many of the details seen in the crew's visit to the revolutionary era were thoroughly researched and are historically accurate. The two-thirds dollar bill was a real denomination and modeled after revolutionary currency, the Continental Congress met in New York on the day the crew visits, and the opal that Professor Farnsworth steals from the queen is based on an actual opal found in the Crown Jewels. Cohen admits that one historical inaccuracy intentionally overlooked was Benjamin Franklin's presence in America on that day. In actuality, Franklin would have been crossing the Atlantic Ocean on his way back from Europe.
Two separate heads of Grover Cleveland appear in the head museum. This is a nod to the actual Grover Cleveland's two non-consecutive terms as president.
David Farnsworth is based on a real revolutionary era counterfeiter of the same name. In his correspondence, George Washington described Farnsworth's illicit activities and his execution. In order to destabilize the fledgling American economy, the British employed a number of counterfeiters, the most skilled among them was David Farnsworth and his partner John Blair. They managed to make over $10,000 (equal to about $352,000 in 2023) in fake Continental currency, mostly in the 2/3-dollar denomination. Fortunately, they were captured before being able to place their fake currency into circulation, a court-martial held on October 8, 1778 found them guilty of counterfeiting and espionage, they were sentenced to death and executed by hanging.
Opals, central to the time travel in this episode, were once thought to contain mystical temporal qualities.
Zoidsmythe, the British version of regular character Dr. John A. Zoidberg, walks in an unusual way in his only scene. His walk is based on the Monty Python sketch "The Ministry of Silly Walks", and the character is imitating the actor of the sketch: John Cleese.