Stupidity: After Eva Grubb first arrives on the island and states her frustrations to the castaways, she walks away and the Professor reveals a plan to not leave her in her current condition and have a boat sent back for her to get her some help. How is he going to do this? If he could contact civilization to get Eva a boat, then how come he could never do the same to get themselves rescued? Furthermore, how would he be able to contact anyone to help Eva anyway?
Trivia: This episode was the only episode to feature a single regular castaway from the show (other than Gilligan) to ruin a rescue attempt at the end. The professor was to blame in this one by making a mistake.
Other mistake: At the beginning of the episode when the Skipper wakes up on the boat this scene is actually from the original pilot, as you can see the 3 different actors that played the part of the professor, Ginger, and Mary Ann. (00:01:20)