Robert Wagner was asked to play Tom Lopaka, but he wanted to concentrate on movies instead. He then recommended his friend Robert Conrad for the role, which led to Conrad being cast. He had a dark tan from his time at the beach during the previous year, when he was looking for work, and that made the producers think of him as a beach type.
Tom Lopaka's full name was Thomas Jefferson Lopaka. Cricket Blake's real first name was Chryseis.
Tracy (Anthony Eisley) served in Pusan, South Korea as a Lieutenant in the U.S. Air Force during the Korean War.