Continuity: When the taxi leaves the airport, it's a 1965 Ford. When next seen en route, it's a 1958 model with really big tail fins. When it arrives at the house, it's a '65 again, with no tail fins.

Revealing: During the fight with the phony delivery men, Illya's stunt double is easily identifiable by the fact that his wig is a completely different shade of blond that doesn't match Illya's hair at all.

Continuity: Could this be the affair of the flying saucer and teacup? As Napoleon Solo is having tea with Miss Partridge, he has his teacup in his right hand with the saucer on the table. Mysteriously, in the next shot, the saucer suddenly appears in his left hand, only to find its way back to the table again. Then both teacup and saucer appear in Solo's left hand. Then both find their way back to the table, then back into his left hand again. And it all happens in a span of about 30 seconds.

Continuity: The bullet holes Solo puts in the attacking robot's chest disappear and reappear several times between shots as it pursues him.

Revealing: Thrush's android army is composed of dozens of identical robot women. The first 6 we see (from behind) do have identical heights, shapes, clothes and wigs. But we then see shots of girls with varying shapes and hair lengths, capped by a far-too-close angle on their obvious (and very bad) rubber masks.

Factual error: Mark Slate's hidden spy camera sure is sophisticated. It cuts to close-ups, pans, zooms, and even edits the live picture, all by itself.

Plot hole: Thrush is so efficient. They divine exactly what Rosy will be wearing on the day they plan to switch her with her double, and they duplicate every last stitch - long before they've ever seen her.

Plot hole: Bound and chained, Illya is dropped into a huge vat of wet plaster. Yet he's able to miraculously produce a 5-foot-long straw from somewhere (where was he hiding that?) to breathe through while the plaster dries around him.

Continuity: One of the masked gunmen is suddenly not wearing his mask, then is masked again and back and forth throughout the scuffle-in-the-bedroom scene.

Continuity: The gangsters' plane, which has two engines on the ground, suddenly has four engines when it's in the air. It also changes colors.

Factual error: Though he's tied up at the time, Solo somehow calls Illya on the pen communicator in his pocket. This leaves us to wonder just how he managed to uncap the pen, extend the antenna and "dial" the frequency (all of which was always necessary before) without the use of his hands.

Factual error: Illya leaps onto the rope in the monastery tower, causing the bell to ring. After sliding down the rope to the floor, he then identifies the tone as "B Major 7th." But the musically-literate Illya should know better. B Major 7th is a chord (B, D-sharp, F-sharp, A-sharp), not a single note.

Continuity: Illya's grappling hook changes positions on the iron window bars between the time it first attaches and the time he starts to climb the wall.

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: 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.

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: 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.

Continuity: Fairbanks fires at the intruders from the doorway of his house. In the next shot, however, he's leaped forward several feet and is now firing from behind a large chair.

Plot hole: U.N.C.L.E.'s pen communicators worked much like modern cell phones: when one agent called another, they "rang" with a 2-tone signal. For some reason in this episode, Solo's pen, which isn't on an open circuit, transmits Illya's voice without ringing first. It signals normally a few scenes later, though.

Continuity: Solo and Illya, chasing a Thrush agent, are driving a white Dodge. When their car overturns, it not only turns blue, it changes into another model of car altogether.