Continuity mistake: 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. (00:24:35)

The Haunting (1999)
Ending / spoiler
Directed by: Jan de Bont
Starring: Liam Neeson, Owen Wilson, Bruce Dern, Catherine Zeta-Jones, Lili Taylor, Virginia Madsen
Luke gets his head ripped off by the lions head in the fireplace. Nell is the great-granddaughter (or great-great-granddaughter, whichever) of Hugh Crane (the owner of the house who killed the children and haunts the house). Nell, the doctor (Liam Neeson) and Theo (Catherine Zeta-Jones) lead Crane to a door where a bunch of spirits trap him. The souls of all the children can finally rest in peace. Nell realizes she has to stay at the house to protect the souls of the children and then dies. Theo and the doc leave the house.
Jonathan
Theo: You feel cut off from the world, but the world has missed you. Happy tossing and turning.
Trivia: When Eleanor is in her bedroom, look in the mirror: both times you see children heads or portraits.
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Answer: Another possibility is the spirits of the children. As long as Hugh Crain was inside the house, the children were trapped inside too. They could have called Nell because they needed her help in being set free.