Anthony Hopkins astounded the crew by delivering the entire seven page courtroom speech in a single take. Steven Spielberg was so overawed he couldn't bring himself to call him Tony, and insisted on addressing him as Sir Anthony throughout the shoot.
Theodore Joadson (Morgan Freeman's character) is a fictional creation. In real life, it was Josiah Willard Gibbs, Sr. (played by Austin Pendleton), a Yale professor of theology and sacred literature, who discovered James Covey, the Mende sailor who served as a translator for the Amistad captives. As depicted in the film, Gibbs learned to count to ten in Mende, and wandered around the docks of New York repeating the numbers, until Covey heard and recognized his own language and spoke to the professor.
The film prompted a lawsuit by writer Barbara Chase-Riboud, who alleged the screenplay for the film plagiarized her book 'Echo of Lions', a fictionalized account of the Amistad incident. The book had been pitched to Steven Spielberg's Amblin Entertainment by Jacqueline Kennedy Onassis. Amblin executives met with Chase-Riboud, turned down that project, then made this film. Amistad writer David Franzoni had previously been hired, by a different production company, to write a screenplay based explicitly on 'Echo of Lions', and his Amidstad script replicated fictional elements, characters, and situations invented by Chase-Riboud. Spielberg's lawyer called the suit baseless and disparaged the Chase-Riboud book, while Franzoni claimed he'd never read it. The suit was eventually settled for an undisclosed amount, on the condition the author make statements publicly supporting the movie.
Though he's shown sleeping through the congressional debate about the Smithson bequest, John Quincy Adams was the chief Congressional supporter of what would eventually become the Smithsonian Institute.
In real life, Roger Sherman Baldwin (played by Matthew McConaughey) was an older and more experienced lawyer than his character is in the movie. A grandson of Roger Sherman (signer of the Declaration of Independence and the Constitution), Baldwin was in his late 40's and a member of the Connecticut State Senate when he took the defense of the Amistad captives. After the Amistad case, Baldwin was elected Governor, and later U.S. Senator for the state of Connecticut. He died in 1863.
John Quincy Adams addresses the Supreme Court and states that when faced with trouble the Mende people invoke the help of their ancestors. As he mentions this we see a portrait of his father John Adams just over his left shoulder.
Morgan Freeman, who played an ex-slave turned abolitionist, stars in this movie along with Chiwetel Ejifor in his first movie role. In the movie "Glory" Morgan plays an ex-slave who ends up a soldier in the Union Army along with Denzel Washington. In "The Inside Man", Denzel & Chiwetel star together.
President Van Buren and former President Adams find themselves on opposite ends of the court case in this film. In real life, Van Buren would later run for re-election in 1848 as a member of the Free Soil party, which opposed the expansion of slavery. His Vice-Presidential running mate was John Quincy Adams's son, Charles Francis Adams.
The trivia item below may give away important plot points.
Beginning during Cinque's lifetime, rumors circulated that he himself became a slave trader after his return to Africa. ('Oxford History of the American People', 1965 states: "The court with a majority of Southerners, was so impressed by the old statesman's eloquence that it ordered Cinque and the other Negroes set free, and they were returned to Africa. The ironic epilogue is that Cinque, once home, set himself up as a slave trader.") However, recent research disproves these rumors (Joseph Yannielli, 'Cinque the Slave Trader: Some New Evidence on an Old Controversy', Common-Place, Vol. 10, October 2009). It is believed that Cinque and the other freed prisoners from the Amistad returned to Africa in 1842, at which time Cinque's home country of Sierra Leone was being torn apart by civil war. Cinque and his companions from the Amistad kept in contact with members from the local Christian mission, and this contact provides today's researchers with pieces of information regarding his later life. After a while, Cinque left the area to trade along the coast of West Africa. Most stories of his later life are simply rumor. George Thompson's 'Thompson in Africa: or, An account of the missionary labors, sufferings...' (1852) puts forward the idea that Cinque had moved to Jamaica. Others held that he had become a merchant or a chief, perhaps trading in slaves himself. However, this rumor of Cinque himself engaging in the slave trade has been seriously disputed. The origin of these claims appears to be statements made by early 20th-century author William A. Owens who claimed to have seen letters from AMA missionaries suggesting Cinque was a slave trader. While it is likely that some of the freed Amistad prisoners probably did engage in the slave trade upon their return to Africa, today most historians agree that Cinque was not among them, and these claims are false.