The Professor from Gillian's Island - No one noticed?
I find these things that tie movies together interesting, but nobody else has mentioned it.
Hank, the guy on this island that uses and later repairs the radio, is the same actor Russell Johnson that years later played the Professor on Gillian's Island. And what did he do as Professor on Gilligan's Island - the SAME THING - he was in charge of their transistor radio and somehow keeps it going (among other things).
I wonder if someone saw him in this movie, thought he made a good radio guy, and offered him a like part in Gilligan's Island?