Hmmm... Actually, I think that when little Sean said "Don't tell Anna".. he actually meant: "Don't tell Anna that I took the letters you buried." Remember that Clara was showing little Sean her dirty hands in the bathroom, meaning she wanted to tell him she tried digging up the letters and found, of course, that they weren't there anymore. SHE knew it was the only way Little Sean could have known all those details about Anna. And Little Sean realized it when he saw her dirty hands...
Little Sean was there in the early scene to show that he was in a position to dig up those letters, and later he recognized Clara as the one who buried them.
Hence: "Don't tell Anna" is just another clever diversion to make us think that he is the reincarnation of Anna's husband.
Little Sean was there in the early scene to show that he was in a position to dig up those letters, and later he recognized Clara as the one who buried them.
Hence: "Don't tell Anna" is just another clever diversion to make us think that he is the reincarnation of Anna's husband.