When Al-Asad's nuclear weapon is detonated, the protagonists' helicopter is caught in the blast and starts spinning, and someone cries "Hold on to something!" - this scene is almost exactly the same as one of the last scenes in the movie, including the shouted line.
When Jill enters the church study, she sees a woman with gray hair, tied in a bun, sitting on a chair, facing the wall. Jill calls out to her, only to find out that the woman is not quite alive. It''s an exact copy of the climatic scene from "Psycho."