Bernard Herrmann considered his musical score for this film to have been his best.
Gene Tierney's first approach to the character of Lucy Muir was playful, almost screwball. After a conference between Darryl F. Zanuck and director Joseph L. Mankiewicz, the first two days shooting were redone so that Tierney could give the character more depth. The change resulted in huge critical acclaim for the actress.
R.A. Dick was the pseudonym of Josephine Leslie, who wrote the 1945 novel "The Ghost and Mrs. Muir".
In 1990 there was serious at talk at 20th Century Fox of remaking "The Ghost and Mrs. Muir" with Sean Connery and Michelle Pfeiffer in the leads, but the poor box-office for The Russia House killed it.
One of a small handful of films produced by 20th Century-Fox which does *not* use the fanfare of trumpets with the opening logo. (All About Eve, Sounder, and The Sound of Music are others.) The moody and lovely opening music is by the film's composer, Bernard Herrmann.
The word "muir" means "the sea" in Gaelic. Many times sailors are said to have been "married" to the sea, or that the only woman they ever loved was the sea.