An October 1957 Los Angeles Times ad shows that Universal Pictures widely distributed this film on a double bill with Interlude, the latter under its alternate title "Forbidden Interlude".
As with most biographical films, the script is a combination of fact and screenwriters' fancy. To give but two examples, Creighton Chaney was not born in a hospital, but at his parents' then-home in Oklahoma City, as was common at the time. Further, Cleva Creighton Chaney was well aware, before her marriage to Lon Chaney, that his parents were hearing-impaired, and had already met them on several occasions.
Last full length feature film of Philip Van Zandt.
On a trip to Hawaii, James Cagney met Roger Smith stationed there in the Naval Reserve, impressed with his clean-cut good looks and appeal, he encouraged Smith to pursue an acting career. Following the advice and after success in several films, Smith reconnected with Cagney who hired him to play his son, "Lon Jr." in Man of a Thousand Faces. Cagney later cast him as his co-star in the musical comedy-drama Never Steal Anything Small.
This film starring James Cagney as Lon Chaney shows Chaney making a scene in The Miracle Man. That film was based on a novel by Frank L. Packard and its stage adaptation by George M. Cohan, who acted in it himself (not in the same part as Chaney, though). And in Yankee Doodle Dandy, Cagney had played Cohan.