Living Doll - S5-E6
Continuity mistake: After Erich takes Talky Tina back out of the trash can and pulls her from the burlap bag, the doll's left arm is pointing straight up above its head. When the shot cuts to a different angle, the arm is suddenly down at Tina's side, even though Erich didn't move it. (00:20:30)
Living Doll - S5-E6
Continuity mistake: When Erich falls downstairs, Talky Tina flies off of the stairs too, yet in the next shot she's shown still rolling downstairs. (00:23:25)
Living Doll - S5-E6
Visible crew/equipment: The boom mike shadow is visible above Annabelle, after she tells Christie that Linda is at the door.
Living Doll - S5-E6
Continuity mistake: When Erich throws Talky Tina across the room, when she hits the floor, her arms and hair change position between shots.
Living Doll - S5-E6
Continuity mistake: When Christie walks up the path, from the car, with her mother, the package she holds swaps arms between shots.
Living Doll - S5-E6
Visible crew/equipment: When Talky Tina calls Erich, the camera zooms in as Erich starts talking - and its shadow appears on his arm.
Answer: It's explained in the episode. The aliens are experimenting to see how humans react to various scenarios. This just happens to involve them using super strength.
Thanks. It's been a long time since I saw the episode so I forgot.