Goof: When Gilligan falls into the munitions pit with the clothesline, you can hear the Professor say "The rope! Why it's holding the trapdoor open." However it is clear to see the Professor is not talking.
"What was a WWII munitions pit doing on an "uncharted island"?" Actually this isn't as uncommon as people may think. In WWII many of the nations would store weapons on islands in the Pacific just in case! Also up until the late 1970s there were Japanese soliders who were on some of those islands who couldn't believe the war was over and still vowed to fight! So as unreal as it seems it did actually occur!
Skipper: (Speaking to Gilligan after he has fallen into the munitions pit with the clothesline enabling the Castaways to climb out.)You didn't kill us. Little buddy you just saved us!
Mr. Howell: I can't stand it. I can't stand it! What are we doing here? Why are we sitting around this hut? Tell me, why, why, WHY???
Skipper: Because the headhunters are out there.
Mr. Howell: I'll buy that.
Theme of episode: When your imagination runs wild, don't go along for the ride.
Episode Title: And Then There Were None
The episode takes its title from the famous Agatha Christie novel of the same name. Both tell the story of a group of people trapped on an island who start to disappear one by one. In the novel the characters are being murdered, in the episode they are falling down a hole but murder is suspected. The novel has been adapted into at least three movies and has been parodied in numerous TV shows.