In the film, Hank is singing with a medicine show when the "Drifting Cowboys" band finds and recruits him. In actuality, he formed the band himself in 1947.
Late in the film, three calendar pages are shown to mark the passage of Hank's last three months. Thus, they are supposed to be for October through December 1952, but the pages shown are incorrect for 1952. They are months most recently correct for 1950.
In the montage sequence chronicling Hank's success following his Grand Ole Opry appearance, all sheet music, publicity photos, etc. depict images of the actual Hank Williams, rather than George Hamilton, the actor portraying him.