Kirk: We're going in--peacefully, I hope--but, peacefully or not, we're going in.
Kirk: Mr. Scott, the ship is yours. Take care of her until I come back.
Scotty: Aye, aye, sir. And have a bonny trip.
Kirk: We'll do our best.
Kirk: You mean to tell me your people just walk into a disintegration machine when they're told to?
Anan 7: We have a high consciousness of duty, Captain.
Spock:There is a certain scientific logic about it.
Anan 7: I'm glad you approve.
Spock: I do not approve. I understand.
Spock: Sir, there is a multi-legged creature crawling on your shoulder.
Scotty: The best diplomat I know is a fully activated phaser bank.
Sar 6: The Earth ambassador's calling with an urgent message.
Anan 7: What is the great immorality, open honesty or a deception which may save our lives?
Ambassador Robert Fox: Diplomacy should be a job left to diplomats.
McCoy: Well, Scotty, now you've done it!
Scotty: Aye. The haggis is in the fire for sure.
Anan 7: My first impression was correct. You are a barbarian.
Kirk: I am?
Anan 7: Don't sound so incredulous, Captain. Of course you are. We all are. A killer first, a builder second. A hunter, a warrior, and--let's be honest--a murderer. That is our joint heritage, is it not?
Kirk: We're less cold-blooded about it than you are.
Ambassador Robert Fox: What are you doing, Mr. Spock?
Spock: Practicing a peculiar variety of diplomacy, sir.
Anan 7: What kind of monster are you?
Kirk: I'm a barbarian. You said it yourself.
Anan 7: I had hoped I'd spoken only figuratively.
Kirk: Oh, no. You were quite accurate. I plan to prove it to you.
Anan 7: You wouldn't do this. Hundreds of millions of people.
Kirk: I didn't start it, Councilman, but I'm liable to finish it.
Kirk: Death. Destruction. Disease. Horror. That's what war is all about. That's what makes it a thing to be avoided.
Kirk: All right. It's instinctive. The instinct can be fought. We're human beings with the blood of a million savage years on our hands, but we can stop it. We can admit that we're killers, but we not going to kill today. That's all it takes - knowing that we won't kill today.
Kirk: Actual war is a very messy business. Very, very messy business.
Kirk: Sometimes a feeling, Mr. Spock, is all we humans have to go on.
Spock: Captain...you almost make me believe in luck.
Kirk: Why, Mr. Spock, you almost make me believe in miracles.
Although Scotty refuses to lower the shields, Ambassador Fox and his aide are still able to beam down.
Shots from the outside of the holding room looking in shot a vividly green wall immediately to the right of the sliding door. Shots from within this room show the wall as yellow. (Doubtless this color change is an artifact of different lighting setups for different shots).
Anan 7 tells Kirk to "go left, down the corridor, then left again" to get to the war room. The war room is attached to the council chamber. Yet when Anan tells his soldiers to take Kirk to the council chamber, they drag him down the corridor leading rightwards away from Anan's office/quarters.
When Spock rescues Ambassador Fox, the cylindrical disintegration chamber (to the right) is in the open position. However, when Spock prepares to destroy it and the camera cuts to a reverse shot (with the chamber to the left), it is instantly in the closed position.