Other mistake: In this movie, after being rescued, the Skipper tells Gilligan they missed the days of miniskirts and Gilligan asks "What are miniskirts?" (As if he's never heard of them). However in the original series, an episode mentioned miniskirts and Gilligan said he can wear "minipants" since Ginger could wear miniskirts. He already should have known what they were.
Gilligan: Hey Skipper, why don't you donate your pants? When they fill with air, we can fly to Hawaii.