In the Episode "Task Force" the aliens use conventional guns. However they sound like children's toy "pop" guns when they are fired, which is probably what they were. The producers obviously forgot to dub the sound of real shots!
David leaves the plant and sees two aliens working on a power cable. Its surprising that they would do this while David, or any human for that matter, would be able to see them, considering the covert nature of the alien operation overall and the strange sight of the workers apparently electrocuting themselves without harm.
Here is another missed opportunity. During the fight with the aliens over the file, Tate knocks down one of them with a stool before it can shoot David. A moment later the alien recovers and shoots Tate on the ladder. Had Tate taken the weapon, the disarmed alien would have been less of a threat, Tate wouldn't have been killed, and David would have had solid evidence of the alien presence on Earth.
The sedan collides with the truck several times. As the truck runs off the road the passenger side of the sedan can be seen and there is no damage. A moment later, as the sedan stops, the right front door is badly caved in.
The narrator states that the location of this episode is Oregon, yet the landscape, especially the beach, is that of southern California.
The big iron gate that Tate closes and padlocks during his escape would seem to be archaic and out of place in a modern industrial plant.
On the DVD release of this episode, Roy Thinnes mistakenly says that Burgess Meredith played the Joker on the Batman TV series. Burgess Meredith played the Penguin. The Joker was played by Cesar Romero.
After the winery incinerates, several tall trees can be seen in the background. These trees weren't seen before the building disappeared, even though the winery wasn't tall enough to conceal them.
The newlywed couple's car is clean before the accident, but when it comes to a stop the hood is covered in dusty soil. No dust was stirred up by the car before or during the accident, so the car should still be clean.
This same plot device (artificial depletion of the oxygen in our atmosphere) was used in the series finale' of Irwin Allen's "The Time Tunnel."
The alien astronaut seals himself in the capsule, flips some switches, and launches the rocket. This is impossible. Only Mission Control can launch the rocket.
David Vincent hasn't given up being an architect after all. Carver hired him as an architect but of course this is an excuse for Vincent to watch Carver's oil fields. At least Vincent has some income to continue his quest although I'm surprised anyone would hire him at this point.
Simone Carver is pretty quick for an old man. From the time when he walks out of the study to get dressed until he walks back in fully clothed is less than thirty seconds.
When the machine is telling the alien "students" about David Vincent, it gives his height as 5' 11", yet earlier when we see his driver's license David's height is given as 5' 9".
When David walks up behind Diane as she is using the laser on the cylinder, bright, multi colored light can be seen emanating evenly in all directions. The scene changes to a closeup behind Diane and now the emanating light mimics the outline of Diane's body.
When Diane is floating the cylinder in the water tank look closely and you can see two wires that support and move the cylinder.
In the establishing shot of the "agents" driving David into the desert and later as they turn off the road, the scenery consists of low lying scrub with mountains in the distance. In between those two shots,as we see a closeup shot of David and the others in the car, the scenery shown through the rear window is different. Now the desert has tall vegetation, called Joshua Trees, and the distant mountains are now much closer.
Although Nightmare takes place in central Kansas, a number of sub-tropical plants are seen scattered throughout the episode. In the opening scene, for instance, near the wooden barn, a large Australian eucalyptus tree is seen - a tree that cannot grow anywhere in that state. Later on, after David Vincent flees the boarding house, one can see in the distance, beyond a pale blue Volkswagen, two large Canary Island date palms. Palms do not grow in Kansas.
Even if butterflies could be made to eat meat, the number of butterflies in the container is far too few to consume that amount of meat.
The narrator states that Grady, Kansas is thirty miles from the geographic center of the United States. Later, at the twin silo, a map of Kansas shows Grady to be located at the center of the state. The geographic center is located in Lebanon, Kansas in Smith County on the state line with Nebraska. The distance from Lebanon to Grady is much greater than thirty miles and is more likely about 130 miles.