I dont think I've seen that episode. So how did Gilligan screw up getting off the island that time?
I'm sure you've seen it, I'd forgotten it too. Its the episode where Tina Louise plays 2 parts...her normal Ginger role, and then Eva this dark haired, super nerdy character that comes to the island to live alone.
Probably the worst screw up Gilligan lets slip that when they're rescued, they're going to send back help for Eva. Eva hides the spark plugs...then...Ginger gives Eva a makeover and Eva realizes she's beautiful and an exact match double of Ginger, so she'll want to go back.
So...she heads back to Hawaii to resume Ginger's life in Hollywood.
First documented case of identity theft!