Continuity mistake: When Abigail and Jack are in bed, we see that Abigail is reading "Exile and the Kingdom" by Albert Camus. As Jack begins to kiss her, she is seen reaching toward the nightstand to place the book on top of a pile of other books, including "Siddhartha" by Herman Hesse. In doing so, she accidentally knocks both books to the floor, but in the next shot, as she reaches over to turn the lamp off, "Siddhartha" has reappeared atop the book pile on the nightstand.
Continuity mistake: In the scene where George and the other man are moving the large safe towards the sinkhole by flipping it repeatedly, it keeps switching between shots of them flipping it and Ruth watching them from the window in the house. The distance of the safe from the hole remains the same in several shots, despite them having gained some ground since the previous shots. In fact in one shot the safe even appears to be *farther* from the hole than in previous shots.