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Seth Grahame-Smith, who wrote both the screenplay and the novel on which the movie is based, explained to Time Magazine that (contrary to many audience members' assumptions) the text-sending man in the bar, whom Henry recruits as his latest partner at the end of the movie, was not meant to be George W. Bush, Barack Obama, or any other real-life public figure. It's just the average man. To quote: "It's not meant to be anyone particular, it's just meant to sort of dovetail with the earlier scene of Henry and Abe." He also said that he himself played the texting man.
Joshua Speed was one of Abraham Lincoln's oldest friends, dating back to their days in Springfield, Illinois. Joshua never actually came to Washington, but his brother James Speed was considered one of Lincoln's oldest friends in Washington, and served as Attorney General from late 1864 until he resigned in 1866.
In real life, Abraham Lincoln was considered the best Greco Roman wrestler of his day, winning over 300 matches. Only one loss is known: on April 22, 1832, Lincoln was thrown in two straight falls by Lorenzo Dow "Hank" Thompson during a wrestling match in Beardstown, Illinois. Otherwise, he was undefeated.
President Lincoln works at a large Oval Office desk while his son Willie plays with toys beneath it. The scene is based on an iconic photograph of President John F. Kennedy and little John Kennedy Jr.
Benjamin Walker promoted the film in character for armed services personnel aboard the USS Abraham Lincoln, an aircraft carrier named for the historical President he plays.