Continuity mistake: When Diane is about to dye her hair, the shampoo bottle changes positions between shots.
Continuity mistake: When Robbie throws his jacket to cover the clown, he throws it effortlessly and misses by far; one can even notice he throws it quite low. Shot changes and the jacket is flying high at a bigger speed.
Continuity mistake: Before the clown attacks him, Robbie stretches his right arm and turns the light off. A shot later his right arm is resting by his side, and he is lowering his left arm.
Continuity mistake: When Carol Ann is in the kitchen while her mom is doing the chair demonstration she is holding up a toy with her left hand and helmet in the right hand. When chair slides across the kitchen floor a close up shows Carol Ann yawning then immediately back to her holding the items. Clearly they inserted the yawn scene in as an after thought.
Continuity mistake: When the parapsychologists are attempting to record Carol Anne through the TV set, Ryan's hands are by his headphones, but the next shot shows him move his hands to his headphones again.
Continuity mistake: When Steve Freeling is in the living room with the Ghostbusters, he has a cigarette behind his ear. In another shot seconds later it disappears then reappears again.
Continuity mistake: During the big-throat scene, Carol Anne's feet alternate between rapid up and down movement, still or just slightly up and down.
Continuity mistake: When Steve's high on pot and tells Diane he loves her, he has his hand raised. A frame later it's down by the blanket.
Continuity mistake: When the big throat is menacing the kids, Carol Anne's position swaps from being left or right to Robbie randomly between shots.
Continuity mistake: When the ghostbusters team goes upstairs with Steve for the first time, Ryan takes his bag off twice.
Continuity mistake: When Robbie is trapped by the tree and Carol Ann is about to be abducted, his bed cover keeps changing back and forth from messy to perfectly folded.
Continuity mistake: In the pool, Diane is surrounded by at least 4 bodies floating together; however, when she grabs the hose to climb up, half a second later, the overview of the pool shows just 2 bodies quite a distance each away from each other. In the next close-up, the 4 bodies reappear.
Continuity mistake: When Diane falls in the pool, the distance to the floating corpse on the left increases or decreases randomly depending on the shot.
Continuity mistake: When Robbie covers the clown, the Chewbacca print on the jacket keeps changing in every shot.
Continuity mistake: Wen the tree grabs Robbie the toy by the window swaps from facing right to left back and forth.
Continuity mistake: After Carol slides through the kitchen floor, Steve rests with his back against the wall, over a brown line. When the angle changes, a frame later, he's resting half a meter to the right of the line.
Continuity mistake: While Diane faces the creature and demands it not to touch her babies, she is resting against a long flat wall, but from the angle behind, half of her body is resting against a corner.
Continuity mistake: The night the clown attacks Robbie, when he turns off the light the lamp and the Darth Vader bust swap positions between shots.
Continuity mistake: Before the clown attack, its left leg keeps changing positions between shots.
Continuity mistake: After Robbie's mom kisses him goodnight, the helmet behind changes positions.
Answer: It seems that the majority of the activity was focusing in on the Freeling house exclusively. It's not fully explained why they were the only house affected, but there are a number of possibilities. Possibly because it's where the highest concentration of spirits were at unrest. Possibly because it could be inferred that the Freelings moved in first given Steven was involved with the company that built the community, and thus they became the first targets. And possibly because they were trying to get to Carol-Anne since she was an easy target.
Also, it is mentioned in the movie that Carol Anne was actually born in the house. That likely caused everything to focus on her.
It was not meant that Carol Anne was literally born inside the house, just while the family was living there. It was just a casual colloquial expression Steven's boss made.
raywest ★