what im thinking of ,has never been written in this site,and im not sure its valid.
But it has to do with the old memory of patrick. 4th of july picnik,aylyn (lili) barlow .
It means that either jane has told this memory to someone or red john is really a psychic.
The only period that jane could have shared this memory with someone, and cant remember it, its during the year after his family's death.Its mentioned (from fbi i think)that prior to working at the CBI, Jane suffered a nervous breakdown due to guilt over the death of his family. He has kept the incident a secret from his CBI co-workers, and it is not in his records.And he was in a mental institution.
THERE(!!!), i think ,he could have shared his old memory with a doctor or a fellow "crazy" guy, who could have said it to red john.
Maybe one of his doctors was red john. he has already used the name "Dr. Joe N.H."
Think about it.