"Kaddish" was written by Gordon due to his fascination with the legend of the Golem from the Kabbalah. Originally, the script called for the antagonist to be an African American "Louis Farrakhan-like" character, but Fox was concerned that the show's increasing popularity with black viewers would be damaged by this, and Gordon agreed to make the villains into, in his words, "cartoonish neo-Nazis". Gastown, Vancouver stood in for many of the exterior shots that were supposed to be Brooklyn. No Jewish synagogue would rent out their space for the episode, so Shaughnessy Heights United Church was renovated to look like one. This included completely redecorating the pews, carpet, and light fixtures, as well as crafting a Jewish altar. The episode's title is a reference to the Jewish mourning prayer service (). "Kaddish" has been critically examined for its themes concerning love and hate.