Continuity mistake: The clown puts his hand around Robbie's throat, but a frame later disappears.
Visible crew/equipment: When Diane and Steve go to their neighbor's house after the scene of the chair sliding across the floor, there's a flash of lightning that reveals a shadow of a fan that's blowing on the actors on the left side of the house.
Continuity mistake: The piece of licorice that Carol Anne puts into the cigar box with the dead parakeet "for when he's hungry" appears to be close to 6 inches long when she's placing it in the box but no more than a couple of inches long when it's shown in the box a few moments later. (00:10:10)
Continuity mistake: Just before the house starts to implode, Teague is backing away from it and as he does so, he passes a couple of white garbage bags on the sidewalk and backs into the street. In the next shot, taken from across the street showing bystanders being blown backwards, Teague is visible in the background; he's back on the sidewalk tripping backwards over the same bags he safely passed moments before. (01:48:10)
Continuity mistake: Toward the end, when Diane and the kids are trying to escape, they start into the kitchen only to see 2 coffins come up through the floor. The initial shot shows the coffins quickly shooting up to almost the same height and then stopping, but in the next shot, in which the coffin on the right opens, the one on the left is a couple of feet lower and is still slowly rising.
Continuity mistake: When Diane is about to dye her hair, the shampoo bottle changes positions between shots.
Continuity mistake: As the Freeling family is escaping through the side of their house, you will notice that Diane is holding a doll that looks like Carol Anne.
Other mistake: In the opening sequence, when Dana is in bed and hears Carol Anne say, "Hello, I can't hear you", for some reason there is a prosthetic leg lying across Dana's bed. (00:03:45)
Continuity mistake: The window in Robbie and Carol Ann's room never has a mini blind. After the tree breaks through the window and the family races up to their room the window is intact with a blind in it. (00:39:00)
Revealing mistake: When Diane is on the ceiling, a piece of something white falls right in front of her, landing on the ceiling. This shows the set was upside down and she was actually on the floor. The scene was shot on a rotating stage but the little piece that falls gives away the effect.
Revealing mistake: Diane runs back from the neighbor's house and falls into the pool. You can see where she is going to fall and she runs right to that spot. It looks like they did multiple takes.
Visible crew/equipment: Near the end when Diane is reaching for the kids and trying to get them out to the hallway, a film light is blatantly visible behind her. Also during the same scene the shadow of a fan can be seen in the hallway.
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.
Factual error: Robbie is grabbed by the big, gnarly tree outside his bedroom window during a severe thunderstorm, and Steve rushes outside to save the boy as a full-blown tornado passes overhead. The tornado sucks up the tree (which certainly weighs several tons); yet, completely defying physics, Steve and Robbie remain unaffected by the powerful updraft, even though the two are directly beneath the tornado vortex.
Visible crew/equipment: Near the end of the film in Carol Anne's bedroom, after the medium calls "Give me your hand" the edge of a giant fan is visible on the extreme right of the picture. (Maybe widescreen version only).
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.
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 colloquial expression.
raywest