I was watching "Full House" today on TV, where Uncle Jesse's Dad complimented Michelle (wearing a very pretty light blue dress for a marshmallow commercial), saying something like, "She looks like one of those girls on "Gilligan's Island". Which one, not Mary Ann, the other one?"
Jesse's mom said, "Tina Louise"
"That's right! She's a teeny tiny Tina!" I thought that was pretty cool.
Also, I was watching "Sister Act II: Back in the Habit" and one of the nuns asked one of the girls in the class if she knew the theme song to "Gilligan's Island" because she had just sang the theme song to "The Love Boat".

Gilligan's Island is a real cultural/pop icon... it is referenced in many movies, too many to count. Some of the more notable ones are:

Twilight Zone: The Movie
Scrooged
Heathers
Teenage Mutant Ninja Turtles
The Addams Family
Dazed and Confused
Sister Act 2
Jumanji
Tommy Boy
Spy Hard
Galaxy Quest
The Blair Witch Project
Magnolia
Gone in 60 Seconds
Cast Away

Plus many more less-famous movies and TV shows.

It was also spoofed in A Very Brady Sequel.

Like BeckyW said, it was spoofed in a Very Brady Sequel, and it was mentioned twice in the Brady Bunch Movie. Once was when I think her name's Holly said "I think Peter's kinda cute. Well, I mean in a Gilligan sort of way" and another time was right after Holly kissed Peter he mentioned Mary Ann and Ginger but I don't remember what he said. I think it was "You're better than Ginger and Mary Ann combined" or something.

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"Well, Laverne is sort of childish" -Shirley

"Childish? Childish? Coming from a grown woman who throws tea parties for her stuffed cat!" -Laverne

"Well at least I don't sew L's on everything I wear!" -Shirley

"Well that would be pretty stupid considering your name's Shirley!" -Laverne