Rob Letterman's first live-action directorial effort, after working on animated films for DreamWorks, including Shark Tale (2004) where he already worked with Jack Black and Monsters vs. Aliens (2009) where he already had to deal with a giant character.
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 this film, while Jack Black was in one area of the sound stage, performing against a green screen, the actors portraying the Lilliputians would be on another part of the stage, acting "opposite" Jack Black.
When Gulliver awakes in the doll's house after he is banished to the 'island they dare not go', he is in his red t-shirt, but then a few shots later after trying to run the water in the sink, he is in the doll's dress.