Continuity mistake: The window in the chamber door changes its size between shots. At first, we can see just Gwyllm's head. But then the window somehow grows so that his head and shoulders are visible. When the window gets smaller again, only part of his head is visible. (00:46:00)
Continuity mistake: When the lab equipment shorts out after the earthquake, the unconscious Major Brothers is lying with his head propped up against the wall. But when Hamilton reaches him in the next shot, he's suddenly lying flat and is nowhere near the wall. (00:21:45)
It Crawled Out of the Woodwork - S1-E11
Continuity mistake: When Joey turns off the bathtub tap, we can see that the water is no longer flowing. But the sound of running water continues. And a few shots later, the water is flowing once more, even though Joey hasn't gone near the tub again. (00:24:30)
Controlled Experiment - S1-E16
Continuity mistake: When Phobos sets up the time converter, the grid on his large round scope has a diamond-shaped pattern. But when we see it from his point of view, the grid comprises perfect squares instead, and contains numbers that weren't there before. (00:15:00)
Don't Open Till Doomsday - S1-E17
Continuity mistake: Harvey peeks into the small hole in the box using his right eye. On the first view from inside the box, a right eye is indeed looking in. But when the monster appears, a left eye is peering through the hole. The shot cuts immediately back to Harvey, who still has his right eye pressed to the opening. (00:06:10)
Continuity mistake: In the lab, the alien's arms change positions instantaneously between shots. (00:13:50)
Continuity mistake: The alien's torn spacesuit sleeve somehow mends itself, but then is torn again a few shots later. (00:46:00 - 00:47:50)
Continuity mistake: General Stocker falls into a lunar quicksand pit and starts to sink. One arm disappears beneath the sand, but in the next shot, both his arms are outstretched and waving for help. (00:04:25)
Continuity mistake: In the lab, Anderson collapses with his arms crossed above his head. When the shot cuts, his arms are suddenly uncrossed. (00:21:30)
Continuity mistake: Dr. Brice's name tag is partially tucked under her collar when she's inside the lab. When she walks into the corridor, the tag has shifted position and is outside the collar. Later, back in the lab, the tag keeps changing from over to under her collar repeatedly. (00:32:50 - 00:36:50)
Continuity mistake: The cloth pillows stabilizing the moonstone on the lab counter change positions several times between takes. (00:40:15)
The Forms of Things Unknown - S1-E32
Continuity mistake: After running through the woods getting soaked by pouring rain, Casha arrives on Kollos' doorstep with her hair neatly coiffed and perfectly dry. In fact, within minutes of coming in out of the downpour, Casha, Leonora and Tone all have completely dry hair and clothes. (00:15:00)