The Merry Widow
- As in the 1925 and 1952 film versions, almost the entire plot is changed from the stage version, though several of the characters are basically the same. Only the made-for-TV versions have used the original plot and characters.
- The 1,000 gas chandeliers on the sets took two hours to turn on.
- It took four months and 12 seamstresses to make Adrian's two dozen designs for Jeanette MacDonald's gowns.
- Una Merkel later appeared as Kitty Riley in the 1952 film version of The Merry Widow (1952), starring Lana Turner and Fernando Lamas.
- Because the contracts of Richard Rodgers and Lorenz Hart contained a clause stating they were a team, they both got on-screen credit for the lyrics of the songs, even though only Hart wrote them.
- A French-language version was filmed simultaneously, with Chevalier and MacDonald in the starring roles. (As a trained opera singer, MacDonald spoke and sang excellent French.) However, the rest of the cast was replaced with French-speaking actors. Marcel Vallée played the Ambassador (who is played by Edward Everett Horton in the English version).
- MGM hired at least 500 extras for the "Merry Widow" dance number.
- The final film collaboration between Maurice Chevalier, Jeanette MacDonald, and director Ernst Lubitsch.