 "Princess O'Rourke" became the penultimate film that de Havilland completed while on contract to Warner Bros.

De Havilland and Cummings both sued their studios over their long term contracts.The composer Arthur Schwartz and lyricists Edward "Yip" Harburg and Ira Gershwin who had earlier written the featured song, "Honorable Moon" (1941), donated the money they received from Warner Bros. to the United China Relief organization.Nan Wynn sings the song during a Chinese restaurant scene.