Toward the end, when Kirk orders Uhura to put him on shipwide intercom, the first two time she speaks it sounds like she's speaking through the intercom unit. But the third time when she says "Ready, Captain," her voice sounds like she's actually in the scene with the others than on the bridge speaking via the com.
Spock says pinpoint accuracy is required for intraship beaming. But neither he nor Scotty go to actually manage the transporter, doing it by remote. Do they have somewhere else to be at the moment? Otherwise it's odd that either or both men don't man the transporter, which is always the case in other dangerous situations requiring pinpoint accuracy.
Mara the Science Officer says that they are 40 against 400. However, later Spock says there are 38 Klingons.
Conveniently, the alien entity only traps the "extra" Enterprise crew, but kills off the excess Klingons by sabotaging their ship and forcing the Enterprise to destroy it. Since it wants as much hatred as possible, why did it only keep 38 Klingons alive rather than let more Klingons live? Maybe not the full complement, but why limit itself to 38?
Spock says there's a "considerable discrepancy" between the actual number of their crew and Klingons, and the number of life forms he detects. However, later he says there's a discrepancy of one. One isn't "considerable."
Trivia: This is the first and only time it is shown that the transporters can handle more than six people at one time.
At the end when the group is laughing at the entity, Leonard Nimoy (Spock) is struggling to stifle laughing along with them.
When Mara tries to convince Kang to listen to Kirk, there is a close-up shot with her and there's a intercom panel over her left shoulder. But in every previous and subsequent wide shot she's standing in front of that big wire-mesh grid that takes up one wall of Engineering.
No one notices the Klingons are beaming down a party (despite the fact we've seen in other episodes the sensors can sense transporter activity) or if they did, nobody bothers to warn Kirk.
As Scotty escapes from Engineering, one Enterprise security guard hits a Klingon in the elbow with his sword, and the guy collapses.
Spock said that Kirk had 8 seconds to get to the transporter but he took 10 seconds because he decided not to take his sword.
At the end when the entity left the Enterprise, it came out of the secondary hull. However it left from the engineering dept. The Engineering dept. is located in the back of the primary hull.
Lt. Johnson had no gold braid.
Kirk: We must talk to Kang. Bury the hatchet.
Spock: An appropriate choice of terms, Captain. However it is notoriously difficult to negotiate a truce with the Klingons once blood has been drawn.
Kang: Klingons kill for their own purposes!
Chekov: Lies! They want to start a war by pretending we did it!
McCoy: Chekov's right, Jim. The Klingons claim to have honored the truce, but there've been incidents, raids on our outposts.
Kirk: No proof that the Klingons committed them.
McCoy: What proof do we need? We know what a Klingon is!
Spock: May I say that I have not thoroughly enjoyed working with humans. I find their illogic and foolish emotions a constant irritant.
Scotty: Then transfer out! Freak!
Chekov: (to Mara) No. You don't die yet. You're not human, but you're beautiful... very beautiful...
Scotty: Keep your Vulcan hands off me! Just keep away. Your feelings might be hurt, you green-blooded half-breed!
Spock: No one can guarantee the actions of another.
Kirk: There's another way to survive. Mutual trust... and help.
Mara: We have always fought. We must; we are hunters ... tracking and taking what we need. There are poor planets in the Klingon systems ... we must push outward if we are to survive.
Spock: Those who hate and fight must stop themselves. Otherwise, it is not stopped.
Kirk: Go to the devil!
Kang: We have no devil, Kirk. But we understand the habits of yours.
Mara: We are 40 against 400.
Klingon: 4,000 throats may be cut in one night by a running man.
Kang: We need no urging to hate humans. But, for the present, only a fool fights in a burning house.
Majel Barrett's computer voice is pitched upward almost an octave and given more reverb, making it almost unrecognizable.
Joseph Campanella was considered for the role of Kang. He would finally appear in a Star Trek episode nearly thirty-three years later in the Star Trek: Voyager episode "Author, Author".
The episode was written with Kor as the lead Klingon, however Jon Colicos was working on another project and was unable to reprise the role (much to his regret, reportedly) and the character of Kang was created instead.
The role that eventually became Kang was originally slated for the character Koloth, first seen in "Trouble with Tribbles".
Michael Ansara reprised his role of Kang in the DS9 episode "Blood Oath" and the Voyager episode "Flashback".
This is the first time a female Klingon is seen, and the only time in TOS.
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