Trivia: Sarek is 102 years old.
When Thelev attacks Kirk in the corridor, listen carefully to the sound of them fighting and you will hear a totally out of place sound that sounds something like a bongo drum being hit or the sound a cartoon might make when a coconut falls on someone's head. A sort of hollow percussion sound that's totally out of place. (This is removed in the remastered version.)
When Kirk orders engineering to cut both starboard and port power, the external shot of ship a moment later shows all of the external lights still on and the engines still churning. On the shots of the bridge, all the equipment is still working, so that sure wasn't much of a power shutdown.
When the Andorian stabs Kirk, it is in his right lower back. No blood is seen and later Bones says Kirk is stabbed in his left lung above the heart.
The Tellarites have boots on even though the Tellarites actually have hooves.
The assassin politely takes time out to adjust his tunic, giving Kirk time to recover from his attack. Then he stabs at Kirk with his knife in his left hand - there's a camera cut to Kirk kicking him and the knife has jumped instantaneously to his right hand.
When Sarek goes into the reception room to take his pill, the Tellarite holding the drink has it in his left/right/left hand depending on the camera shot.
After Amanda leaves Spock's cabin, he goes up to the door and touches it in contemplation. How does the door know not to open?
For some reason Kirk has the mirror in his cabin at waist height. He has to squat down to adjust his uniform at the beginning of the episode. Exactly what does he look at in a mirror at that height?
In one scene the Enterprise's phasers were pink instead of blue. (This is fixed in the remastered version.)
In one scene on the bridge, the space sensor array was not moving.
Spock: There is no logic in the attack on the Captain. There is no logic in Gav's murder.
Shras: Perhaps you should forget about logic, and devote yourself to motivation and passion again. Those are reasons for murder.
McCoy: My patients don't walk out in the middle of an operation!
McCoy: Well, I'm glad someone is asking me something around here.
(after telling everyone to shut up)
McCoy: Well, what do you know? I finally got the last word!
Amanda: Vulcans believe peace should not depend on force.
Spock: Humans smile with so little provocation.
Sarek: Tellarites do no argue for reasons; they simply argue.
Spock: Worry is a human emotion.
Spock: It means to adopt a philosophy, a way of life which is logical and beneficial. We cannot disregard that philosophy merely for personal gain, no matter how important that gain might be.
Sarek: One does not thank logic.
Spock: It would be illogical to kill without reason.
Sarek: Offense is a human emotion.
Sarek: Threats are illogical.
Amanda: Oh, logic. I am so tired of hearing about your logic.
Spock: Emotional, isn't she?
Sarek: She has always been that way.
Spock: Indeed. Why did you marry her?
Sarek: At the time it seemed like the logical thing to do.
Kirk knew that Spock's father was an ambassador ("This Side of Paradise"), that Spock's family was "important enough" to have T'Pau officiate at his wedding ("Amok Time"), and of course, that Spock is half Vulcan and half Human. Given the seeming rarity of Humans and Vulcan/Human marriages, it seems unusual that Kirk doesn't see a Vulcan ambassador with a Human wife and not make the natural conclusion.
It is revealed that Spock had a pet sehlat, a sabretooth tiger-like creature that would be later shown on the Star Trek: The Animated Series episode "Yesteryear" and the Enterprise episode "The Forge."
This episode marks the first time that the four founding members of the Federation - Terrans, Vulcans, Andorians and Tellarites - are all seen together.
In addition to introducing Spock's parents, Sarek and Amanda, this episode also introduces two familiar Star Trek aliens: the Andorians and the Tellarites. Ironically, by not going down to a planet in this episode, the producers were able to spend more of the episode's budget on alien make-up.
Mark Lenard previously played the Romulan commander in "Balance of Terror".
Desilu No: 5149-44.
Though Sarek doesn't appear in any more episodes of classic Trek except the non-cannon animated episode "Yesteryear", he appears in the Star Trek III, IV, and V movies and makes two guest appearances in The Next Generation. Amanda also reappears in Star Trek IV.