The voice of the radio announcer is supplied by James Doohan (Scotty).

For the first and only time in the series, the episode ends in a freeze-frame.

Kirk: Gentlemen. Gentlemen. This, uh, this card game is a kid's game.
Tepo: You think so?
Kirk: Gentlemen. Gentlemen. This, uh, this card game is a kid's game.
Tepo: You think so?
Kirk: Oh, yes. I wouldn't waste my time.
Tepo: Who's asking you?
Kirk: On Beta Antares IV, they play a real game. It's a man's game, but a little beyond you. It requires intelligence.
Tepo: Listen, Kirk, I can play anything you can figure out. Take the cards, big man. Show us how it's played.
Spock: I'm familiar with the culture on Beta Antares. There aren't games...
Kirk: Spock. Spock. Of course the cards on Beta Antares IV are different, but not too different. The name of the game is called, uh... fizzbin.
Tepo: Fizzbin?
Kirk: Fizzbin. It's, uh ... not too difficult. Each player gets six cards, except for the player on the dealer's right, who gets seven.
Tepo: On the right?
Kirk: The second card is turned up, except on Tuesdays.
Tepo: On Tuesday.
Kirk: Mm-hmm. Oh, look what you got, two jacks. You got a half fizzbin already.
Tepo: I need another jack.
Kirk: No. If you got another jack, why, you'd have a sralk.
Tepo: A sralk?
Kirk: Yes. You'd be disqualified. You need a king and a deuce, except at night, when you'd need a queen and a 4.
Tepo: Except at night.
Kirk: Right. Oh, look at that. You've got another jack! Ha ha ha! How lucky you are! How wonderful for you. If you didn't get another jack, if you'd gotten a king, why, then, you'd get another card, except when it's dark, you'd give it back.
Tepo: If it were dark on Tuesday.
Kirk: But what you're after is a royal fizzbin, but the odds in getting a royal fizzbin are astron... Spock, what are the odds in getting a royal fizzbin?
Spock: I've never computed them.
Kirk: Well, they're astronomical, believe me. Now, for the last card. We'll call it a kronk. You got that?
Tepo: What?

Krako: What do you think, we're stupid?
Kirk: I don't think you're stupid. I just think your behavior is arrested.
Krako: I haven't been arrested in my whole life!

Oxmyx: You better come back down. Krako's put the bag on your captain.
Spock: Why would he put a "bag" on our captain?
Oxmyx: Kidnapped him, ya dope. He'll scrag him, too.
Spock: If I understand you correctly, that would be a problem.

Bela Oxmyx: The most cooperative man in this world is a dead man.

McCoy: We're trying to help you, Oxymx!
Bela Oxmyx: Nobody helps nobody but themselves.
Spock: Sir, you are employing a double negative.
Bela Oxmyx: Huh?

Spock: Logic and practical information do not seem to apply here.
McCoy: You admit that?
Spock: To deny the facts would be illogical, Doctor.

Tough Kid: I'll cut off your head and throw it in your face!

Kirk: Now, look, Krako, we're takin' over the whole ball of wax. You cooperate with us, and maybe we'll cut you in for a piece of the action.
Spock: A miniscule... a very small piece.
Jojo Krako: How much is that?
Kirk: That's, um... we'll figure it out later.
Jojo Krako: Thought you guys had laws--no interference.
Kirk: Who's interferin'? We're takin' over. Check?
Spock: Right.

Krako: I want to know what happened.
Scotty: Looks like we put the "bag" on you.
Krako: I got rights.
Scotty: You've got nothing. You mind your place, mister, or you'll be wearing concrete galoshes.
Krako: You mean cement overshoes?
Scotty: Um ... aye.

Spock: Must we?
Kirk: It's faster than walking. Are you afraid of cars?
Spock: Not at all. It's your driving that alarms me.

Spock: I'd advises youse ta keep dialin', Oxmyx.

Kirk: Gentlemen, you two have been brooding ever since we returned to the ship.
Spock: Brooding, Captain?
Kirk: Brooding, Mr. Spock - a somber emotional state. Do you wish to continue it or discuss it?
Spock: Captain, I'm neither brooding nor somber.

Anthony Caruso is credited as "Bela Oxmyx" at the end, but in Krako's office there's a dartboard made out of a poster of Oxmyx, and it's spelled "Okmyx."

What Changed in the Remastered Version
General improvements cited on the main series page. The orbital shots of Sigma Iotia II get a surface upgrade and continents and oceans are much clearer. Phaser shots are significantly upgraded.

Lt. Hadley is referred to by name for the first time.

Kirk refers to McCoy as "Sawbones."