Goofs

The barrier at the edge of the Milky Way galaxy, established in Where No Man Has Gone Before (1966) and By Any Other Name (1968) is apparently forgotten. Additionally, it is never explained why the visual distortion didn't occur in those occasions when Enterprise left the galaxy.

When Marvick entered Miranda's quarters, the doors opened automatically when she 'authorized' him to enter, but when he left her quarters, he had to press the door button to open the doors.

Towards the end of the scene where Kirk and McCoy discuss Miranda, Kirk finishes his drink swallowing the very last drop. The next cut then shows the cup is still quarter full without sufficient time for a re-fill.

Miranda states she can telepathically see what Marvick saw when he looked at the Medusan. Why didn't it drive her insane?

When the visors are seen in a front view, they have a border area. But in "reverse" angle shots, from a character's point of view while putting on the visor, there is no border.

The Enterprise is cast out of the Milky Way galaxy and they claim they have no point of reference to return. However, there are thousands of massive objects they could use to navigate with to return home. Other galaxies, nebula and even the Milky Way would be a reference point to use for navigation.

Dr Jones is a human of Earth origin, not a Vulcan, Betazoid, or any other Trek Universe telepathic race. So why does she have telepathic abilities? It is explained that, while Dr. Miranda Jones is human, she has never visited Earth. Her extraterrestrial existence could account for her telepathic abilities.

In the last scene, Spock places the visor over his eyes to protect himself from the Ambassador when initiating transport. Kirk should have vacated the room. However, he is still in the room, thus risking himself to insanity (as shown by him walking out after the transport is complete). There is no need for Spock to don the visor at this point. It was obviously done to allow a reversed re-use of the shot of Miranda and Kollos beaming aboard, saving the cost of a second special effects shot.

During the fight scene in engineering, one of the 'bowling ball holders' gets bumped out of position.

(At approximately 21 minutes) When Mr. Spock opens the panel below the Engineering station on the bridge, the space behind it is empty of any equipment, unlike other such panels in earlier shows.

The controls Larry Marvick commandeers have nothing to do with the ship's helm. To take control from the bridge, he would have to go to the auxiliary control room on the second level of Engineering.

Close-up of Kirk is mirrored after Miranda says "It seems I have no choice but to obey you."

As Spock contacts the Bridge to announce that he and Dr. Jones have escorted Ambassador Kollos to his quarters, the camera moving towards him projects its shadow onto the bottom left of the picture.

When Kollos and Miranda Jones beamed off the Enterprise at the end, Spock had to put on his visor since Kollos became briefly transparent and viewing him with the naked eye resulted in madness. Yet Kirk was standing off to the side watching as the two beamed away, with no visor and with no apparent ill effect.

The Enterprise has over 400 crew members, yet the ship's corridors are strangely deserted throughout the story.

When Dr. McCoy bends over to kiss Miranda Jones; hand, she glances down at her hand. Since she is blind, there would be nothing for her to see. Her sensory web would have conveyed his movements to her, but not provided any visual input.

When Miranda shouts "That's a lie!", Kirk responds, "Oh, yes it is!", revealing that Diana Muldaur's scripted line must have been "That's not true!".

When the announcement is made to clear all corridors so that the ambassador can be escorted to his quarters, a crewman in blue and a woman next to him stop to listen. As they walk off camera, the man is chewing gum.

After Kirk shoots Spock with the phaser, McCoy bends down to check him as security gets set to move him to sick bay. While bent down, McCoy takes a quick look up at the camera.