When Commander Remmick transports Quinn to the Enterprise, there is a clear shot of his neck - with no "spike" on it. However, it turns out that Remmick was the host of one of the parasites, so he should have had one.
When the Enterprise alters course to investigate the debris field, it is shown that while Geordi is at the helm, the Ops console is unmanned, while Data is presumably doing the research Captain Picard had requested. This is itself is a goof, as it is shown in many episodes that whenever an officer has to leave such a post, another officer always replaces them. In a further goof, in the next shot from a similar camera angle, Data's hand is seen, implying that he is, in fact working at the Ops console.
Worf suggests that the debris that they discover might have come from one of the ships that had been orbiting Ditalix-B, and Geordi adds that that's possible because they're "close to that planet". However, it is difficult to understand what Geordi is trying to add to the discussion, considering that the Enterprise had just left Ditalix, and were quite obviously near that planet.
When the Captain arrives for dinner, and they have tea while waiting for the dinner to be prepared, there are only three glasses on the table. As they expected Riker to be there as well, there should have been four.
Trivia: Captain Walker Keel is the only person during the entire series to actually pronounce 'Jean-Luc' with a proper French accent; specifically 'Luc' which cannot be easily pronounced by those whose main language is English. Not even Patrick Stewart himself can say it properly.
When Admiral Quinn is fighting Worf, Worf gets thrown across a table. Worf's feet collide with the replicator and it noticeably shifts.
During the fight between the parasite-possessed Quinn and Commander Riker, it's fairly obvious that it's a stunt double wearing (highly unconvincing) old man make-up that is doing most of the fighting.
Admiral Aaron is equipped with the ultra slow phaser. While everyone else's phaser hits its target almost instantly, Aaron's phaser takes a full two seconds between being fired and striking the wall behind Riker and Picard. This gives them just enough time to dodge.
When Riker ambushes the Admirals at the dinner, Savar attempts to use a Vulcan neck pinch on him. He must have done something wrong, because he is pinching Riker for about three seconds before he stops and Riker is fine.
Why do Riker and Picard, having merely incapacitated the other parasite-infested hosts, feel it necessary to shoot Remmick until his head explodes?
When Quinn punches Riker there's no prong sticking out of his neck, even though Crusher says later that anyone infected will have a prong sticking out.
Remmick is wearing three solid pips (commander) at the beginning of the episode. At the end when Picard and Riker confront him, he's only wearing two and a half (lt. commander).
When the admiral fires a phaser at the pursuing Picard and Riker, he misses and hits a painting and sparks fly. But in the next shot the painting is undamaged.
Admiral Quinn displays superhuman abilities that overstimulated adrenaline glands can't account for (such as Riker punching him hard enough to break his jaw). Overstimulating a (relatively) old man's adrenaline glands would most likely give him a coronary.
In the beginning of this episode, Riker orders Geordi (who was navigator at the time) to increase to Warp 6. In response, Geordi replies, "Aye sir, Full Impulse."
At the end of the top secret meeting, Walker, who is paranoid about everyone in Star Fleet, and who specifically tells Picard that as far as all their Star Fleet colleagues are concerned the meeting "never took place," then immediately asks Picard to, "tell Beverly that I said hello"!
Troi: Data, have you ever been for a real moonlight swim?
Data: One can swim in moonlight?
Troi: How about you, Mr. Worf?
Worf: Swimming is too much like... bathing.
Riker: Why the devil would we be going there? Are there any miners or indigenous life forms on the planet?
Data: I believe the answer is negative to both questions, sir. In a manner of speaking, it is nothing but a lifeless hunk of rock, a useless ball of mud, a worthless chunk of...
Riker: Thank you, Data. I get the idea.
Worf: Are you all right?
Geordi: Ugh. If I could see, I'd be seeing stars!
Data: (thinking out loud) Startling. Quite extraordinary, in fact!
Computer: Direction unclear. Please repeat request.
Data: That was not a request. I was simply... (with a surprised look)...talking to myself. A human idiosyncrasy, triggered by a fascination with a particular set of facts, or sometimes brought about by senility or used as a means of weighing information before reaching a conclusion, or as a...
Computer: (interrupting) Thank you, sir, I comprehend.
The episode won an Emmy Award for Outstanding Makeup for a Series.
Admiral Quinn's case containing the alien creature is a modified Nintendo Power three-ring binder.
The topographical map of the planetary surface has a very crude drawing of the Japanese manga characters, Kei and Yuri, from Dirty Pair, also known as Lovely Angels in Japan. Kei is upside down, and Yuri is on the right side.
In the scene where Riker enters the room with the Starfleet officers who have been taken over, Jonathan Frakes's bowl was the only one filled with real worms. During one take, when he lifts some worms over his mouth to pretend he was one of them, a worm accidentally fell and landed in his mouth. He ate the worm and continued the scene, but they didn't use that cut in the final version.
Michael Berryman (Captain Rixx) loved the Bolian make-up so much that he actually wore it home after filming was completed for the day.
All of the FX shots of Earth and the spacedock are from the Trek movies.
This plot is somewhat continued in the Deep Space Nine books which occur after Season 7 of that series and which many fans consider to be Season 8 of DS9. These parasites are hinted at in the Mission Gamma 4 part set, Rising Son, then heavily featured in Unity, which also explains a connection to the Trill, and where the Jem'Hadar that disappeared in the DS9 episode "Sacrifice of Angels" went.
The first time this episode aired there was no graphic content warning. However, people were so upset by some of the images, they put a warning of graphic content at the beginning of the episode for subsequent regular and syndicated airings. It was the only time this was ever done for an episode of any Star Trek series. The public's reaction to the worm villains in this episode was so negative, Roddenberry said they would never be used again.
First appearance of the Bolian species in the form of USS Thomas Payne commander Captain Rixx. The blue-skinned species was named for director Cliff Bole and would become a recurring species throughout TNG, DS9, and VOY.
This really creepy episode was intended to be one of the lead-ins for the introduction of the Borg, a new race developed when the Ferengi failed to deliver the threat the creators had intended. The message sent at the end was intended to have been sent to Borg space, though no future episode specifies where that message goes.
The conspiracy is hinted at in the earlier episode "Coming of Age," which also featured Admiral Quinn and Lt. Remmick, and where it is suggested that something bad is going on in Starfleet, which is the reason for their inspection on the ship and crew.
Wesley Crusher (Wil Wheaton) does not appear in this episode.
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