Kirk: You think Harry Mudd is down there, Spock?
Spock: The probability of his presence on Motherlode is 81%, plus or minus .53.
McCoy: Why can't you just say, "Mudd's probably there"?
Spock: I just did, Doctor.
Harry Mudd: Welcome to Motherlode, gentlemen. Interested in purchasing a little love?
Kirk: We're interested in you, Harry, for fraud, illegal drug manufacture, and swindling.
Harry Mudd: As I said, welcome to Motherlode. A charming planet which does not recognize Federation law.
Kirk: I thought we left you on the robot planet, Harry, permanently.
Harry Mudd: Never underestimate the spirit of Harcourt Fenton Mudd. I... borrowed a vehicle...
Spock: "Stole a spaceship."
Harry Mudd: And left to find haven on Elyria 6, a charming planet. An innocent and friendly populace.
Kirk: To whom you sold the Starfleet Space Academy. Harry...
McCoy: Did I ever tell you about the time I saved Captain Kirk's life? Or Spock's? And my dear friend Scotty. And that pretty little Lt. Uhura. I've saved about everybody on this here ship. If the Enterprise had a heart, I'd save you, too. Now let's talk about your heart, my dear.
Kirk: How long does the effect of the potion last, Harry?
Harry Mudd: I... I don't know. Not long according to the creature I swindled... I purchased the crystals from.
Harry Mudd: Think I'll get rehabilitation therapy again?
Spock: I can guarantee it.
Harry Mudd: Well, that's all right. I just hate to leave you all. All my loved ones.
When Chapel falls into Spock's lap, her collar turns black.
And then reverts to its normal blue.
When Harry offers the remaining crystals he holds two of them.
Kirk runs out and tosses them up, and he has over a half dozen.
When they go into the creature's mouth, there are only two again.
Normally Spock's insignia is on the left side of his shirt.
But in when one reaction shot when he looks up at the creature, it's on his right side.
As the two creatures fight, Kirk's shirt turns red.