Kubrick thought Sluizer's 'The Vanishing' the most terrifying film he had seen-even more frightening than 'The Shining,' and it led to Kubrick 'phoning the Dutch filmmaker to discuss editing.
When George Sluizer was told he could direct an American version of the book "Het Gouden Ei" (which had already been made in the Netherlands as The Vanishing (1988)), he was told that this would only go through if the ending was changed because the American audience wouldn't approve the original ending. The original ending has Jeff Harriman leaving Rita without telling where he went. Jeff isn't saved and dies in the coffin, and Barney survives - without being caught.
When Jeff starts writing the note to Diane that he's going to look for her, he puts no dash after "Di". Yet when you see him put the note on the windshield, there is now a dash after Di, and the handwriting is different.
In the beginning of the film, when Barney is meeting his daughter at the bus/train station, as the bus pulls up, the camera angle widens and you can see the extras ("background") waiting at the top of the stairs for their cue to walk down. As the scene progresses, the woman in the jeans and red sweater and her male companion are seen coming down the stairs as Barney and his daughter begin to walk up the stairs.