Factual error: When Ray and several others are riding in an automobile they pass underneath a railroad bridge. Passing over them on the bridge is a modern day container type train, a train of the era that the film portrays would be made up mainly of boxcars, tank cars, etc. not shipping containers.
Continuity mistake: When Ray and the doctor are discussing psychotherapy, there is a patient and hospital attendees milling about behind Ray near the sofa. There is a close up of the doctor, then Ray, and a few seconds later the patient and attendees are gone (the patient is moving waaay too slowly to make such a quick exit).
Factual error: In one scene, Ray is frying chicken. He proceeds to flour a couple of pieces and drop them in the pan containing hot grease. There is a piece already in the pan that is done, so Ray holds out the pan to his friend to take the piece of chicken. His friend reaches into the pan, removes the piece of chicken and immediately bites into it. Fried chicken that has just been removed from hot grease cannot be immediately eaten. It has to be removed and allowed to cool for a few minutes. The friend would have burned his fingers as soon as he reached into the pan and then would have burned his mouth as soon as he bit into the chicken.
Continuity mistake: When Ray's mother is about to put Ray on the bus to the St. Augustine blind school she hangs a sign on his chest with his name. As they discuss the need for an education the shots cut from behind Ray to in front of him to behind him. Look at his shirt on his back right shoulder. The collar is tucked under his suspender when viewed from behind the first time then is is not the next time they show him from behind. Ray did not move to make this happen, it just happened from one take to the next.
Continuity mistake: During the opening scene, Ray is playing "I Got A Woman" on the piano. However, the filmmakers don't sync up the film of Ray's hands with the right part of the soundtrack, which results in Ray moving his hands to play in the upper register, but the notes sounding the same.
Continuity mistake: When Ray is improvising his performance in a bar, because he has 20 minutes to go, the shot shows the POV from the crowd to where Ray is singing and playing on stage. Two musicians next to him are talking and laughing with each other, yet, in the next shot, they suddenly have their mouths to their instruments and are playing along.