You will be happy to know that the real-life family of Don Shirley (the musician portrayed in the film) have strongly criticized the movie for its inaccuracy.
The movie was based on a book written by the family of Tony Lip. But according to some, it greatly over-emphasized the roll that he played in Don Shirley's life.
This is a lie because all movies based on real events are 100% accurate 100% of the time.