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 - 00:36:50Jean G
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.
Factual error: When the energy monster kills his entire research staff by stopping their hearts, Dr. Block brings them all back to life (with their minds and personalities intact) by installing pacemakers. But when the heart stops functioning, brain death occurs within minutes. For this to work, he'd not only have to operate on several people simultaneously, he'd also have to be the fastest heart surgeon on Earth.
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.
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.
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.
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.
Revealing mistake: When the alien posing as a human is exposed, the OBIT screen shows his "true" alien form while he continues to appear human to the naked eye. The actor in alien costume on the screen copies Jeff Corey's movements, but at one point rather badly shatters the illusion by forgetting to raise his arms when Corey does.
Plot hole: Andro has memorized "every detail" of Cabot Jr.'s life, including his mother's name, Noel. Yet when he travels to the past, meets Noel and learns her name, he still mistakes Cabot Sr. for Cabot Jr., who isn't born yet. Having memorized all those details, he would have known the moment he met her that Noel was Jr.'s mother. Andro's confusion makes no sense.
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.
Other mistake: Mace's chest camera sends images from impossible angles - including several that include Mace himself. At the end, his superiors watch him from a camera that's obviously mounted in a tree and not on his person. Yet when Mace smashes his chest camera, the transmission goes dead anyway.