Continuity: 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.

Visible crew/equipment: Barton is terrified by a plant-like alien floating outside his spaceship window. The Venusian critter might be a heck of a lot scarier if it bore less resemblance to a furry stalk of celery - and if only its puppet strings weren't showing.

Continuity: The cloth pillows stabilizing the moonstone on the lab counter change positions several times between takes.

Continuity: In the lab, the alien's arms change positions instantaneously between shots.

Continuity: 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.