Continuity mistake: When Liam and his other two mates are inside there house, Liam looks at the projection screen and stands up to take the slide out of the machine. Between shots there is nothing in his right hand as he stands up, yet in the following shot he is holding a can of lager in his left hand. (00:03:15)
Continuity mistake: When we see all the group sitting in the house talking about the ouija board, Rob is talking to Stella saying "calm down Stella, think about what you're saying". Rob's hands are together, then when he says this to Stella, he is suddenly pointing his whole hand at her, then in the following shot his hands are together again. (00:34:10)
Continuity mistake: At the beginning when Annie gets killed, she tries to climb up the window and grabs a hold of the bar at the top, when the Djinn is on the roof and looks up at Annie, her hands/arms are at a different position on the bar from the previous and following shots. (00:23:55)
Continuity mistake: At the end when Liam is holding a lantern in his hand, he turns to walk up to the elevator still holding the lantern, he does not put it down, and then looks in the elevator's window. When Lucy drops down from a rope, the lantern is about 3 or 4 feet away from the elevator. (01:17:25)
Continuity mistake: Just after Annie has been killed, Lucy is in her barge looking through a book about the Djinn, and in a shot of the book there is a picture with a man crouched in a corner and a firey hand over him. When we see the book in an overhead shot, just before it cuts away, neither the picture nor the headline is anywhere on that page, and she did not flip the pages over. (00:28:35)
Continuity mistake: Near the beginning when the group of mates are sitting round a pane of glass ready to do the Ouija board, as the camera first pans round the friends, if you look closely you can see that Liam has his arms on the top of the pane of glass, but when the shot cuts to the camera they setup, his arms or hands are on his legs. (00:12:35)
Continuity mistake: During the Ouija board scene the glass smashes. During the scenes that follow the glass is visible on the table in the background, completely whole.