Revealing: Right after Nell sends Hugh to hell, Dr. Marrow and Theo come out of hiding behind a pillar. As Marrow puts his hand on the pillar, it squishes in as if it was made of foam rubber, instead of stone.

Plot hole: Theo refers that Nell is from Boston, despite the fact that the two have just met, and Nell never mentioned that fact.

Continuity: When Nell opens the ledger which lists the dead children, in the first shot there are no people crossed out in the ledger. In the following closeup, there are.

Continuity: While they're all having their first dinner at Hill House, everyone has a little red wine. The wine levels in Lili Taylor's glass go up and down between different shots.

Continuity: In the scene in which the girls enter the playroom with the revolving floor, you see them, in a shot from the back, step onto the moving floor.  In the next shot, from the top, they are back in the entry and step onto the moving floor a second time.

Continuity: In the scene where Theo first sees her room, she runs and flips into the bed. You then see her head fall back onto the pillow. The flip should have caused her feet to hit the pillow.

Continuity: As Nell pokes around in the furnace under the fireplace with her iron poker, the bones and ash in it tend to move around, changing their positions many times between shots.

Continuity: When Nell runs to the Circular Room the second time, she is looking at one of the mirrors. She sees herself pregnant. If you look close, you can see her reaction in the mirror. She brings her hand over her mouth. In the next shot, she does the same thing again.

Continuity: When Nell arrives at Hill House, after Mr. Dudley opens the gate and she drives through, between shots the amount of brown leaves on the ground around the gates increases.

Audio problem: When Nell is helping Theo carry her bags to her room, Theo turns to Nell and says "well, everyone calls me Nell, don't you love it here?" Immediately, Theo then says "I love it." But her lips don't move, she's just smiling.

Continuity: When Nell walks to the bookcase, where she was led by the bloody footprints, the vase of peacock feathers on the desk in front of her, change positions between shots.

Continuity: When Nell is in the study, the photo album of Crane opens. It then nearly falls so she grabs it. As she grabs it you can see the page has a picture on it, of two people's face very close up. But in the next closeup of the same page, the picture has changed and it is now Crane standing alone in the centre of the picture.

Continuity: When Nell is searching for Dr. Marrow, and she stops his work on the table, the tape recorded on the table changes position between shots.

Visible crew/equipment: As Nell turns around to see all the lights in the house turning on, we see in the background, the rest of the group trying to save Luke, but at the very beginning of the shot, you see a blue light quickly flicker behind Nell, that couldn't have been the cars lights, which only means that was the crew's lights.

Continuity: When Nell finds the picture album of Hugh Crain and his wife it passes around 3 or 4 pages. But when Nell grabs it, it's about 10 or 20.

Continuity: At the first afternoon, Nell is filling out some tests in the Great Hall. We see her put down the same paper twice, one from the ground shot; the other from overhead.

Continuity: When Nell arrives at Hill House and converses with Mr. Dudley through the gates, the oval plate in the centre of the gates had spikes all around it, facing outwards away from the house only. Later when Luke crashes the gate, an oval plate falls with spikes on - spikes which are now facing in toward the house.

Visible crew/equipment: At the end of the film, when the Dudley’s arrive, Mr. Dudley opens his door, and in the far right of the door window, a crewmembers head is reflected.

Continuity: When Nell opens the ledger, it shows the first page. Two people are crossed out in the ledger. In between the rows which have been crossed out, there are ten rows of recorded people, which aren't crossed out. Nell then puts the ledger on her lap, and is still on the same page. Yet when it shows the page again, there are now only five rows in between the two crossed out ones.

Continuity: When the older people come at the end of the movie, the part of the gate that fell on the car was gone.