Nell Potts, who plays Rachel as a young girl, is actually Joanne Woodward and Paul Newman's daughter.
The production was a small-scale budget but eventually emerged as a moneymaker.
The uncredited baby on the beach with Rachel at the end of the film is Claire Newman, then age 2, whose face is never shown because she was crying throughout most of the scene; the waves lapping against the shore scared her, as she didn't yet know how to swim.