The house where Ken (Richard Egan) and Sylvia (Dorothy McGuire) live toward the end of the film is an actual private residence that was built by Frank Lloyd Wright in 1948. It is called the Clinton-Walker House, still stands today on Scenic Road in Carmel-by-the-Sea, California, and is a prime feature in local tours.
The role of Molly was offered to Natalie Wood, but she turned it down. She would later say that she regretted doing so.
Richard Egan's (Ken's) impassioned speech to his wife about her disgraceful bigotry was so powerful that an entire packed audience at Radio City Music Hall gave it an immediate standing ovation.
Although he was only 38 when he made this movie, Richard Egan was already being cast in middle-aged roles.
As Max Steiner's famous score plays, Sandra Dee tells Troy Donahue the plot of "King Kong" - which was scored by Max Steiner.