This is the first time "Skull Island" is used as the name of a Scooby-Doo setting.
Occurs on January 9. The Magnus Shipping Company manifest shows that the next ship sails on January 10, "tomorrow" in the episode.
Adapted by Gold Key Comics' "Scooby Doo... Where Are You!" #6, as The Ghost of Redbeard, with minor changes to the plot.