LeVar Burton was credited and did not appear in this episode. (edit) Alan Oppenheimer appears on DS9 as Captain Keogh in "The Jem'Hadar," and on Voyager as the Nezu Ambassador in "Rise." (edit) This episode marks the final appearance of Robert O'Reilly (Gowron) on the series. (edit)

Worf: I do not know what to believe.
Kahless: You doubt the real Kahless will return one day? You doubt that he is still waiting for you in Sto-Vo-Kor? Kahless left us, all of us, a powerful legacy. A way of thinking and acting that makes us Klingon. If his words hold wisdom and his philosophy is honorable, what does it matter if he returns? What is important is that we follow his teachings. Perhaps the words are more important than the man. (edit) Chancellor Gowron: Have you ever fought an idea, Picard? It has no weapons to destroy, no body to kill! (edit)

Kahless, who is revealed to be a clone, is found to have identical DNA to the blood on the knife which Gowron brings aboard. However in the next episode "Second Chances", Dr. Crusher says that a clone will always have a "genetic drift" in their DNA pattern--how come it was not detected in Kahless? (edit) The last time that a Klingon Emperor ruled is in question. According the Klingon stories, Kahless existed 1,500 yrs ago. In the episode "Sins of the Father", Worf's nurse tells Picard that Mogh was loyal to the "emperor", that appears to be 20-30 yrs ago. In this episode, "Rightful Heir," it is said there hasn't been an emperor in 300 years. (edit)

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