When Daniel storms away from where he buried Jordan he slams his shovel into the pile of dirt at the side of the grave. Later when the police show up the shovel is gone.
When Jordan is checking the FBI Agents briefcase, she has a hair grip hanging down from her hair.
Daniel shovels less than a foot of dirt on the coffin Jordan is in before he storms off. She should have easily been able to lift the lid of the coffin and saved herself.