I read an other comment on this film about the life of Lon Chaney and I agree that it is a terrible biography about the great actor, but what was neglected was to say that this film was a showcase for James Cagney. Cagney had become typecast in his gangster roles and wanted to show his other talents and that is exactly what this film does. Although the acting is undeniably Cagney it still shows a range not possible in his hoodlum roles. Like some of his other "breakout" films like Yankee Doodle Dandy, Cagney shows his range of emotion, mimicry and skill.
I originally saw this as a kid who was in love with the old horror classics of my day and this film did inspire me to search out and see the older films. The black and white silent films where actors had to act to convey the story. They had to overplay their parts to make up for the lack of words. That is what you see from Cagney in the short sequences meant to recreate the filming of those great silent Chaney films. I highly recommend it to any film lover.