- Joanne Woodward's likeness was used for the painting of Marguerite Wyke.
- "Eve Channing" is a combination of "Eve Harrington" and "Margot Channing," the two main characters in Joseph L. Mankiewicz's "All About Eve". "Higgs" is the name of the dead body in Tom Stoppard's play "The Real Inspector Hound", a parody of Agatha Christie-type mysteries. "Alec Cawthorne" is also the name of a film writer for the BBC.
- One of only two films for which the entire cast was nominated for the Best Actor Oscar (the other was Give 'em Hell, Harry! (1975)).
- 'John Addison' was nominated for an Oscar for his music score. However, he was not originally among the five nominees when then nominations were announced. He was added to the list after the score for Godfather, The (1972) was deemed ineligible.
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