Other mistake: During the time capsule recovery ceremony, there is a man standing next to Nicolas Cage, who pulls out his cell phone to take a picture of the ceremony. However, he's holding the cell phone wrong, pointing the camera towards himself.
Other mistake: He says his wife died in a hotel fire at 4 am, and then says he was blowing leaves when she died. Who blows leaves at 4 in the morning? Or even 7am allowing for the time difference?





Answer: It is a rock from the ground of the final location on the list, where the spaceship has landed to transport Caleb and Abby to their new home. It is merely a clue as to where they should go on the day of October 19th.
Katie..x