Peggie Castle was originally cast in It Conquered the World (1956) but had to pull out of the movie. Roger Corman asked for Sally but she was already several months pregnant. Corman saw her, thought she would be fine and worked around her scenes with close-ups. The movie took five days to shoot.
Was the original "Betty Anderson" in the plot for Father Knows Best (1954) The producers went with Elinor Donahue in the series because they wanted someone younger.
As of 2004 was living on a ranch in Idaho with her husband.