During the communication with Admiral Fitzpatrick in the briefing room, the screen displaying the admiral shows down to his mid-chest area in the wide shots, but closeups only show down to his shoulders.
Cyrano Jones cannot pronounce the word Klingon correctly. He constantly says "Klingin" instead of Klingon. Captain Koloth appears to have the same problem.
When Koloth is requesting that the tribbles be removed from the room, part of his goatee (on his left side) disappears.
In the last exterior shot of the Enterprise and the station, neither one is moving.
Chekov's drink repeatedly changes hands between shots.
Kirk says the Klingons will always be accompanied by an equal number of security guards, but there are no security guards present during the bar fight.
What exactly was Kirk planning to do if the tribbles didn't eat the grain when he checks the bins? It's an overhead door - if he'd gotten it open it would have cascaded down onto him.
During the bar fight there's nobody with blue shirts present, but when Kirk lines up the supposed participants for discipline, there are two men with blue shirts present.
Kirk confines Scotty to quarters, but a scene or two later he's back on the bridge and stays there until the end of the episode.
Kirk: Mr. Chekov, this flight is supposed to provide both experience and knowledge. How close will we come to the nearest Klingon outpost if we continue on our present course?
Chekov: Ah, one parsec, sir. Close enough to smell them!
Spock: That is illogical, Ensign. Odors cannot travel through the vacuum of space.
Chekov: I was making a little joke, sir.
Spock: Extremely little, Ensign.
Kirk: Does everyone know about this grain but me?
Checkov: Not everyone, Kepten - it's a Russian inwention.
Trader: Four credits.
Cyrano Jones: Is that an offer or a joke?
Trader: That's my offer.
Cyrano Jones: That's a joke.
Kirk: (to Nilz Baris) We have guards around the grain; we have guards around the Klingons, and the only reason they're there is because Starfleet wants them there. As for what you want, it has been noted and logged.
Scotty: When are you gonna get off that milk diet, lad?
Chekov: Milk? Why this is vodka!
Scotty: Where I come from, that's sodapop. Now this is a drink for a man.
Chekov: It was inwented by a little old lady in Leningrad.
Korax: We like the Enterprise. We really do! That sagging old rust bucket is designed like a garbage scow. Half the quadrant knows it! That's why they're learning to speak Klingonese!
Scotty: [after Korax insults the Enterprise] Laddy, don't you think you should rephrase that?
Korax: (in Scottish accent) You're right - I should. I didn't mean to say the Enterprise should be hauling garbage... I meant that it should be hauled away as garbage!
Kirk: Scotty, you're... confined to quarters until further notice.
Scotty: Aye sir. Thank you, sir! That'll give me a chance to catch up on my technical journals!
McCoy: Do you know what you get when you feed a tribble too much?
Kirk: A fat tribble.
McCoy: No, you get a whole bunch of hungry little tribbles.
Kirk: Well, all I can suggest is that you open a maternity ward.
(Kirk orders a coffee and sandwich from the replicator, but instead gets more tribbles.)
Kirk: My coffee and chicken sandwich? (shows Spock) This is my coffee and chicken sandwich? (losing his patience) I want these things off the ship. I don't care if it takes every man we've got. I want them off the ship!
Nilz Barris: Captain Kirk, I consider your security measures a disgrace. In my opinion, you have taken this important project far too lightly.
Kirk: On the contrary, sir, I think of this project as very important. It is you I take lightly.
McCoy: And from my observations, it seems (the tribbles) are bisexual, reproducing at will. And, brother, have they got a lot of will.
Kirk: Too much of anything, Lieutenant, even love, isn't necessarily a good thing.
McCoy: It's a human trait to love little animals, especially if they're attractive in some way.
Spock: Doctor, I am well aware of human traits, I am frequently inundated by them, but I've trained myself to put up with just about anything.
McCoy: Spock, I don't know much about these things, but I do know one thing. I like them...better than I like you!
Spock: Doctor, they do indeed have one redeeming quality.
McCoy: What's that?
Spock: They do not talk too much.
Spock: A most curious creature, Captain. Its trilling seems to have a tranquilizing effect on the human nervous system. Fortunately, of course... I am immune... to its effect. (begins cuddling and stroking the tribble, then stops himself when the crew look at him and leaves with Kirk)
McCoy: Lieutenant, do you mind if I take one of these down to the lab and see what makes it tick?
Uhura: Well, all right, Doctor, but if you're going to dissect it I don't want to know about it!
McCoy: I won't harm a hair on its head... wherever that is.
Baris: There must be thousands of them!
Kirk: Tens of thousands.
Spock: One million seven hundred seventy one thousand five hundred and sixty one.
(everyone stares at him)
Spock: That's assuming one tribble, multiplying with an average litter of ten every twelve hours over a period of three days.
Kirk: As captain of this ship, I want two things done. First, find out what killed the Tribbles, and second... close that door.
Baris: Kirk, I will hold you responsible for this!
Kirk: Mr Baris I'll hold you in irons if you don't shut up.
Scotty: Just before they went into warp, I beamed the whole kit and kaboodle into their engine room, where they'll be no tribble at all.
Even in the re-mastered version, Koloth's lines "Captain, we Klingons are not as luxury-minded as you Earthers. We do not equip our ships with--how shall I say it? Nonessentials. We have been in space for five months. What we choose as recreation is our own business." are omitted, as is his curving hand gesture.
According to the Star Trek: Deep Space Nine "Trials and Tribble-ations" episode, the events of this episode take place on a Friday, and last approximately 18 hours between the time the Enterprise is ordered to space station K-7 to the point at which Kirk reveals Darvon to be a Klingon spy.
David Gerrold originally wrote the role of "Ensign Freeman" for himself, but wasn't able to play the role, because he was too skinny to be an Enterprise crewman. This resulted in Paul Baxley, a frequent extra and stunt man, getting a great deal of screentime and dialogue.
William Campbell was intended to return as Koloth in several more episodes as Kirk's Klingon counterpart, including the episode "Day of the Dove" and several episodes of the planned, but never produced, fourth and fifth seasons.
William Campbell, who portrayed the mischievous Trelane in "The Squire of Gothos", reprised his role as Koloth in the DS9 episode "Blood Oath".
When Scotty says "They're into the machinery as well." if you look closely at his right hand, you can see that he is missing his middle finger, he lost it when he was in the Royal Canadian army during D-Day. This episode and "Catspaw" are the only two episodes in which you can see his finger is missing.
Charlie Brill showed up to cause even more trouble as Arne Darvin in the Star Trek: Deep Space Nine episode "Trials and Tribble-ations."
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