In the scene preceding the 1964 T.A.M.I. show, when James is discussing The Rolling Stones with Pop, one of the other acts, the American rock band The Beach Boys, is depicted in the background rehearsing vocals.
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During the rehearsal that James called after spotting Pee-Wee mocking him, James explains to Clyde (the drummer) how he wants the drums to come in for the song. James' explanation is how the actual recorded song "Cold Sweat" begins on the record.
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James Brown learns that the Rolling Stones will close the TV show, not him. Ben Bart says the band will soon be forgotten. Fifty years later, The Stones are still performing together, and frontman Mick Jagger is this film's executive music producer and one of its main producers.
Just before James hits the stage on the T.A.M.I. show, there's a shot of two of the hosts ready to introduce James and the Flames. (One of which, was dressed as a Fire Fighter) This footage was actual footage from the 1964 broadcast of the T.A.M.I. show. The 2 people are Jan & Dean (Dead Man's Curve).
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This is Aunjanue Ellis' third film based on a real life musician. She previously portrayed Mary Ann Fisher in Ray (2004), based on Ray Charles, and Sandy in Notorious (2009), based on Biggie "Notorious B.I.G." Smalls.
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Many of the actresses in this film have starred in previous films by Tate Taylor. Viola Davis was previously in The Help (2011) as Aibileen Clark; Octavia Spencer has appeared in all of Tate's films, first in Chicken Party (2003) as Laqueta Mills, then as Mary in Pretty Ugly People (2008), and then Minny Jackson in The Help (2011); Allison Janney has also appeared in Tate's previous works, first as Barbara Strasser in Chicken Party (2003), then Suzanne in Pretty Ugly People (2008), and Charlotte Phelan in The Help (2011); Aunjanue Ellis previously appeared in The Help (2011) as Yule Mae Davis; and lastly, Nelson Ellis appeared in The Help (2011) as Henry the Waiter.
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Ben Bart handcuffs a suitcase full of cash to Big Junior's wrist. As Elwood Blues, Dan Aykroyd walked on stage with a suitcase handcuffed to his wrist.
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The third time Chadwick Boseman has played a real person first time was in "The Express" second was "42".
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When James and The Flames hop onstage to perform their rendition of Caldonia, the music used was an actual recording of the real James Brown's rendition. However, the original includes a horn section which was removed due to the Flames not yet having a horn section in the film.
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Mario J. Radford, who portrayed a chauffeur for James Brown is currently a substitute teacher in Nicholaville, Kentucky.
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Spoilers
The trivia items below may give away important plot points.
In the movie, James Brown is shown to be married only twice. In reality, he had four different wives.
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In the film, James Brown is abandoned by his mother in 1939, making him 5 or 6 years old. In real life, Brown was four years old when he was abandoned by his mother.