The painting technique depicted in this film is inaccurate. The approach the painters used in dial factories was "lip, dip, paint." The technique depicted shows the workers licking the paintbrush after having dipped their paintbrush. This technique would be ineffective, since the paint is essentially being licked off before the application.
Radon, a Radium decay product, kills over 21,000 Americans every year according to the US EPA.
The actual name of the company that was sued in 1927 was United States Radium Corporation - not "American Radium"
Olivia Macklin's debut.