Stanley Tucci, the only non-British cast member, adopted a British accent to fit in. He said he had long wanted to perform with a British accent, and this film gave him the chance to do so.
It is estimated that Legendary Pictures lost between $125 and $140 million on the film.
A golden harp can be seen twice throughout the movie--once in a flashback when a giant is stealing it, and again when Jack is in the room with all the treasure. In the Jack and the Beanstalk fairy tale, a harp that plays by itself is one of the items Jack steals from the giant.
Creating the giants took four main steps. The first step was using performance capture, which was used to capture the actor's facial/body movements and render them in a real-time virtual environment. The second step took place during principal photography, where Simulcam technology was used to help the human characters virtually interact with the giants that were rendered earlier. The third step was a second performance capture shoot to adjust giants' movements to seamlessly fit the live-action performances. The final step involved putting the finishing touches on the giant's animation, skin, hair and clothing, and composition in the shots.