"Lux Radio Theater" broadcast a 60 minute radio adaptation of the movie onDecember 12, 1938 with Leslie Howard reprising his film role. Olivia de Havilland performed with him after having just filmed Gone with the Wind together.
Percy Blakeney refers to one of the boxers as "Mendoza", a reference to Daniel Mendoza, the 17th-century British Jew who revolutionized boxing. Mendoza was the heavyweight champion of England from 1792-5, despite being a middleweight.
The original director, Rowland Brown, was fired on his first day at work.
The original play opened in London on 5 January 1905, three years before it was novelized.