Although critics and audiences disliked it for being too gross and childish, the scene in which Gulliver saves the King from the fire in the palace by putting it out with urine is actually taken directly from Jonathan Swift's book. However, in the original novel, the person rescued in this manner is the Queen. The only other adaptation to include this scene is Gulliver's Travels (1996).
The Lilliputian palace is, in reality, Blenheim Palace, which is where former U.K. Prime Minister Sir Winston Churchill was born.
In the harbor containing all of the pun-named boats, the one to the far right is called Swift Passage, an allusion to Jonathan Swift, the author of the book upon which this movie was loosely based.
Director Rob Letterman felt it was important for "Jack Black to interact with the other cast members, and for those interactions to feel natural, as if they all really were in the same room." Thus, thanks to the use of the DualMoCo camera, which was used extensively for the first time on the film, while Jack Black was in one area of the soundstage, performing against a greenscreen, the actors portraying the Lilliputians would be on another part of the stage, acting "opposite" Jack Black.