The Squackle Quiz The big mystery on “Gilligan’s Island” was February 4, 2011 davepoobond Leave a comment The big mystery on "Gilligan's Island" was why Ginger never had fish stains on her evening gowns. why the Professor could build a rocket and a radio transmitter out of coconuts, but couldn't find a way to get off the island. JUST WHERE WERE THE TOILETS? View Results Loading ... Share this:EmailFacebookTwitterMoreRedditTumblr