"Amazing Grace" . . . amazing but misleading
The movie has its main character, William Wilberforce, singing words that his clergyman, John Newton, had written.
In the movie, Wilberforce sings the words to the melody we associate today with “Amazing Grace,” and that same melody occurs at other points in the movie.
However, the familiar words were not adapted to that particular melody until AFTER Wilberforce’s death.
Furthermore, while the entire history depicted in the movie took place in England, the later fitting of the original lyrics to the now-familiar melody took place in the United States.