The scene of Creighton leaving home to take care of his natural mother is completely false. Around that time, not only was Creighton married, but was the father of 2 children and was working for his father-in-law.
This movie's depiction of Chaney's makeup for "Phantom of the Opera" is very misleading. The movie's version shows Chaney's face unrecognizable and nearly immobile behind elaborate full latex appliances. Chaney was actually proud of his ability to distort his appearance using only a minimum of makeup - in this case basically thin wires in his nose and around his eyes, false teeth and dark paint around his eyes and nostrils.