The erupting volcano seen in many an episode was actually a large miniature left over from the noted 20th Century-Fox financial disaster, Doctor Dolittle (1967)
Mike Lookinland (The Brady Bunch) was the first choice to play Fred Robinson but passed on the role,in which he later regretted. Future Eight is Enough star Willie Aames was ultimately tapped for the part.
This series was shown in some territories as "Island Of Adventure" to distinguish it from the 1974 Canadian series.
Since its 2019 purchase of 20th Century Fox, Disney, the studio behind the popular 1960 film adaptation, has owned the rights to the series. Incidentally, the show had aired opposite NBC's broadcasts of the Disney anthology series, while this series aired on ABC, itself now owned by Disney.