Factual error: Ole and all the Thrush baddies call the missing chemical component a "catalyzer," repeating the term throughout the episode. This was a scriptwriter's error, which only David McCallum, to his credit, corrected: he had Illya say "catalyst," which is what the writer meant. "Catalyzer" isn't a word.

Continuity: Sylvia is carrying her huge "opus" sculpture out of the art gallery. In the next cut, though, we see a full shot of her showing both her hands empty: she's not holding the sculpture. Next shot, she has it back in her hands again.

Other: Illya orders an espresso from Fred, the coffee house proprietor, but never pays for it. And Fred doesn't take a bill to his table or speak up when he leaves without paying.

Continuity: The Thrush assassins have an armed golf cart (with a machine gun that handily spews both flames and bullets at the same time). When the cart overturns, the two men fall into a sand trap and tumble several feet away from the vehicle. In the very next shot, they're lying right beside the cart again.