Although marketed as a family film, it was notably darker than the creators' previous material. The animatronics used in the film were considered groundbreaking. The primary concept artist was the fantasy illustrator Brian Froud, famous for his distinctive faerie and dwarf designs. Froud also collaborated with Henson and Oz for their next project, the 1986 film Labyrinth, which was notably more light-hearted than The Dark Crystal.
A tie-in novelization of the film was written by A.C.H. Smith. Henson took a keen interest in the novelization, as he considered it a legitimate part of the film's world rather than just an advertisement. He originally asked Alan Garner to write it, but he declined on account of prior engagements. Henson and Smith met several times over meals to discuss the progress of the manuscript. According to Smith, the only major disagreement they had arose over his dislike of the Podlings, which he considered "boring". He included a scene in which a Garthim carrying a sackful of Podlings fell down a cliff and crushed them. Henson considered this scene to be an element of "gratuitous cruelty" that did not fit well into the scope of the story. In order to assist Smith in his visualising the world of The Dark Crystal, Henson invited him to visit Elstree Studios during the filming of the movie. In June 2014, Archaia Entertainment reprinted the novelization, though included extras such as some of Brian Froud's illustrations, and Jim Henson's notes.
A tie-in novelization of the film was written by A.C.H. Smith. Henson took a keen interest in the novelization, as he considered it a legitimate part of the film's world rather than just an advertisement. He originally asked Alan Garner to write it, but he declined on account of prior engagements. Henson and Smith met several times over meals to discuss the progress of the manuscript. According to Smith, the only major disagreement they had arose over his dislike of the Podlings, which he considered "boring". He included a scene in which a Garthim carrying a sackful of Podlings fell down a cliff and crushed them. Henson considered this scene to be an element of "gratuitous cruelty" that did not fit well into the scope of the story. In order to assist Smith in his visualising the world of The Dark Crystal, Henson invited him to visit Elstree Studios during the filming of the movie. In June 2014, Archaia Entertainment reprinted the novelization, though included extras such as some of Brian Froud's illustrations, and Jim Henson's notes.