Much of the lore of Kahless, revealed here, originated from dialogue cut for time from Birthright, Part II (1993).
In a line cut from the episode, Data revealed that Kahless' death occurred 1,547 years prior to the episode.
A throne for Kahless was especially constructed for the episode, featuring for the first time a new variant of the Klingon emblem (red on a yellow field), replacing that of the previous one (red on a gray field), used under the reign of K'mpec. The new variant was adhered to for the remainder of the television franchise, arguably to indicate that the Klingon Empire was now under new, albeit titular only, leadership.
This episode marks the final appearance of Gowron on Star Trek: The Next Generation (1987). His next appearance is in The House of Quark (1994).
This episode features the Kahless shrine in Worf's quarters for the first time. It will later be seen again in the seventh season's Firstborn (1994).