Mary Ann: He didn't mean any harm, Skipper.
Skipper: Neither did the iceberg that sunk the Titanic.
Mr. Howell: Captain, can you give me one good reason why you haven't put up the sail?
Skipper: Yes, Mr. Howell, we haven't got a sail.
Mr. Howell: Can you give me another good reason?
Gilligan: Hey Skipper, why don't you donate your pants? When they fill with air, we can fly to Hawaii.
Dean: We're expanding. This will be the biggest university on the west coast.
Professor: But we're on the east coast.
Dean: That's how big I want it to be.
Professor: Miss Ainsworth, turn off your macho.
Suggested correction: The castaways had a radio which always gave them information on the outside world (since being shipwrecked). Although usually the Professor used it the most, Gilligan has been seen in the original series listening to it himself, so he could have heard about the movie (out 3 years before the rescue) while still on the island.
Except that the Professor said that the radio hasn't worked in over ten years so Gilligan humming the theme song to Jaws would be impossible and all other current events wouldn't be known to the others either as they are asking about Jimmy Carter, Gerald Ford and Ginger asking about Watergate thinking it's the last name of a person.