Before Isabel jumps off the cliff, she throws away her cell phone, then takes her tape recorder from her pocket and throws that away, too. When Allison dreams the events in reverse, both the tape recorder and cell phone fly back into Isabel's hands, but she never even touches her pocket.
The District Attorney has determined that Greg Watt spoke to his girlfriend on the phone just minutes prior to her committing suicide, yet he doesn't ask him what she said, what her state of mind was, or if she said she intended to kill herself--and if so, why he didn't try to stop her. That kind of information would be vital to the case.