When Nell is cleaning hotel rooms, a picture of an owl with long legs can be seen on the wall. The picture is that of a demon called Stolas, as depicted in a 19th century French demonology text called "Dictionnaire Infernal".
As part of the promotion for the upcoming release of the film, a salon scare prank was set up in which an actress would hide behind salon mirrors and scare the customers (the actual prank is included on the DVD/Blu-ray release of the film).
The trivia items below may give away important plot points.
After Nell has killed Frank Merle and set the home for girls on fire leaving her friends to die, she gets into a car and is seen wearing her iconic boots from the previous film (they were not seen throughout the entire film).
Was originally rated R by the MPAA for a scene where Chris slits his throat graphically until the scene was edited for a PG-13 rating (the unedited version of the scene along with some other deleted scenes were restored for the unrated DVD and Blu-ray release).