The scenes where Oliver Wendell Holmes visits his wife's grave were filmed at the actual grave of Oliver Wendell and Fanny Holmes in Arlington National Cemetery.
"Lux Radio Theater" broadcast a 60 minute radio adaptation of the movie on May 19, 1952 with Ann Harding and Louis Calhern reprising their film roles.
The play, "The Magnificent Yankee," opened at the Royale Theater in New York on January 22, 1946, and ran for 159 performances, with Louis Calhern in the lead role. While other Hollywood actors were eligible to play Oliver Wendell Holmes, MGM decided to let Calhern reprise his Broadway role in the film, to thank him for his many years of service as a supporting player at their studio.
The house of Justice Holmes was at 1720 I Street, NW, in Washington. The filmmakers have the correct number on the house. The house, which was three blocks from the White House, has been demolished, along with the rest of the surrounding residential neighborhood, and replaced by low-rise office buildings.