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Killer trivia for that movie, even if seriously dated:

Jan and Dean both were scheduled to appear in the film, supporting Fabian, who was borrowed from 20th Century Fox. Jan and Dean were pulled by Columbia after Dean’s friend, Barry Keenan, became involved in the kidnapping of Frank Sinatra, Jr. in December 1963.[6] They were replaced by Tab Hunter and Peter Brown.[5][7]

Of the three surfer leads, raven-haired Peter Brown was made into a blonde by makeup artist Ben Lane (to match the hair of Brown’s surfing double – and to keep all three men from being brunets), which required his girlfriend, the blonde Barbara Eden, to have auburn hair; likewise the dark-haired Shelley Fabares – who is paired with the dark-haired Fabian, became a Scandinavian blonde. Susan Hart’s black hair was sufficiently different from her male counterpart Tab Hunter’s that no change was required.