When he traveled back to November 12, 1955, Doc Brown had several $50 bills adorned with Ulysses S. Grant's portrait in his money suitcase. In 1931, when Marty McFly discovered how the password system at El Kid worked, one of the answers he gave to a question by Matches was "Ulysses S. Grant". In 1876, Beauregard Tannen expressed confusion, due to Edna Strickland talking about time court, by stating "what in Ulysses S. Grant is she talking about?".