In the movie there is an unanswered questions on rocks on tombstones in a Jewish cemetery. Putting rocks on tombstones is most often described as a Jewish custom. That a rock symbolizes a visitor and when put on a tombstone says, "I remember you." It is also documented that some people pick up a rock wherever they are and when they think of a person that has passed. Then, the next time they visit the grave, they place the rock to say, "I wish you were here."