Can't get that link to work, for some reason.
All About Eva:
A woman named Eva Grubb comes to the island to get away from civilization, but changes her mind when a makeover turns her into a duplicate of Ginger.
Interesting - no "pre-credits" sequence on this episode - must've been just an occasional thing.
Nice quote from Mrs. Howell "Anyone who says money can't buy happiness doesn't know where to shop."
Odd little episode, as the castaways' good-heartedness and trust costs them a chance to get off the island, and the "baddy" effectively comes out on top.
Back Story: Mrs. Howeel claims not to be able to speak French, despite having claimed fluency in the language back in "You've Been Disconnected".
Taking It Seriously: For the second time, a double of one of the castaways randomly lands on the island. (I'm not counting Gilligan's "twin" as "random".) This seems to me to stretch credibility more than a bit.
As far as Eva goes, I don't think she'll find it as easy as she thinks to take over Ginger's life. I don't generally think it that easy to step into someone's shoes, no matter how much you may look like them.
Gilligan Spoils A Rescue: No.