The novel, and the mini-series were based on the real-life marriage and murder of New York socialite William Woodward, Jr. and Radio actress and showgirl Ann Eden.
While opening scenes of movie are set prior to end of WWII (1945), stock footage features a sign for Broadway production of A Streetcar Named Desire which didn't open until 1947.
In 1955, Ann makes an operator-assisted long distance call from England to United States and is connected to her party in less than ten seconds - an impossibility even now, with direct dialing.
Billy Grenville Jr.: Did he invite you to dinner? Did he? No, probably more like, "Why don't you come watch me play polo sometime, it'll give you a chance to wear that tiara!"