The camera zooms to a big close-up of Sir Rex Harrison's left eye just before fading to each of Alfred De Carter's infidelity fantasies. Harrison happened to be blind in that eye, the result of childhood measles.
At one point, Detective Sweeney (Edgar Kennedy) mentions "that Italian guy." He is referring to Arturo Toscanini, one of the world's most famous conductors, who, at that time, led the NBC Symphony Orchestra in weekly concerts on the radio. Toscanini had previously conducted the La Scala Orchestra, the Metropolitan Opera Orchestra, and the New York Philharmonic.
The orchestral conductor, Sir Alfred De Carter, was based loosely on the real-life British conductor Sir Thomas Beecham who was the son of pharmacist Sir Joseph Beecham, the inventor of the laxative Beecham's Pills. Accordingly, Sir Rex Harrison's character, Sir Alfred De Carter, is said to be named after Carter's Little Liver Pills, the American equivalent.
Carole Landis, who was dating Sir Rex Harrison at the time, was originally set to play Daphne. Personal problems between them caused her to be replaced by Linda Darnell.
Unfaithfully Yours (1948)' release was delayed because studio officials feared a backlash from the negative publicity surrounding the July 1948 drug overdose suicide of Carole Landis, who was rumored to be having an affair with Harrison, and whose body was found by Harrison at her home.
Unfaithfully Yours (1948)' release was delayed because studio officials feared a backlash from the negative publicity surrounding the July 1948 drug overdose suicide of Carole Landis, who was rumored to be having an affair with Harrison, and whose body was found by Harrison at her home.
According to an interview with Terry Jones about the film, recorded for the Criterion Collection release, writer and director Preston Sturges stole some of the most romantic lines of the film from his own love letters to his wife.