The movie changes all sorts of historical facts: The movie makes Emmett a bachelor wooing "Jean Mason" who is confined to a wheelchair. The song Dixie was intended as a sort of dirge but is given a sprightly tempo only because the theater, in the deep south, has caught fire. In fact Emmett married Catherine Rives circa 1853 and remained married until her death in 1875, there is no indication that she was disabled. Dixie was first sung, and at its familiar tempo, in NYC on April 4, 1859, in a non-burning music hall. The movie has only the first verse sung over and over again because, frankly, the second and third verses are a bit "unenlightened" by modern standards. A couple of years later Emmett was appalled that the Confederacy had appropriated his song and he promptly wrote several songs for the Union Army.
In this movie, Dan Emmett's birthplace is in Kentucky. He was actually born (and died) in Mount Vernon, Ohio.