Revealing mistake: When Nick Parsons /Jonathan Devereaux knocks Libby out, if you look carefully before he puts her in the casket you can see he's holding a dummy/doll from the wide angle. (01:23:53)
Revealing mistake: When Ashley Judd slams Tommy Lee Jones' car and tips it over, she drives off and skids dramatically to a stop. Just before she skids, you can see several skid marks on the ground from practice or previous takes.
Revealing mistake: The movie is set in the USA, however, when the US Coast Guard boat ends the search for the husband's body and returns to the dock, Ashley sits on a gray bin with the words "City of Langley" on the side. Those shots were filmed in Langley, British Columbia, Canada.
Suggested correction: Langley, BC, is a landlocked city in the Greater Vancouver area, so this was filmed somewhere else with Langley's markings on the vehicles.
Revealing mistake: When Libby goes to the house to kill her husband with the gun she checks the bullets. You can see the firing pin is drilled out, rendering the gun inoperable.