Episode Trivia


When Spock gives the orbital distance in miles of the Enterprise to Lincoln, he says "Using your old-style measurements..." Spock has used "miles" in the past, such as in "The Immunity Syndrome", and Kirk and Sulu use miles too when they talk about changing orbit in "The Deadly Years."

Surak would later reappear in "Awakening", an episode of "Star Trek: Enterprise".
Final appearance of a Klingon in The Original Series.
Because she did not appear in "All Our Yesterdays" or "Turnabout Intruder"; the final episode, this is the final appearance of Lieutenant Uhura.
The image of Kahless the Unforgettable conflicts with his appearance in the "Star Trek: The Next Generation" episode "Rightful Heir". But since the Kahless in this episode has a smooth forehead wears a "smooth-forehead" Klingon uniform, it's probably best to infer that the Yarnek created the image of Kahless out of what Kirk expected him to look like.
Colonel Green would later be referenced in the "Star Trek: Enterprise" episodes "Demons" and "Terra Prime".