Hello! Look, I love your show. It's the only TV drama I make it a point to watch. But I have some concerns.
Please, please don't have a "surprise" twist in which it turns out that the characters don't know they're dead. This would presume they've never seen Jacob's Ladder, The Sixth Sense, Carnival of Souls, Outward Bound, Between Two Worlds, Haunts of the Very Rich, Siesta, or half a dozen episodes of The Twilight Zone (especially "The Occurrence at Owl Creek Bridge") and Night Gallery.
Oh, and don't make the plot so hopelessly convoluted that you can never explain anything satisfactorily (see: the second season of Twin Peaks).
SMALL UPDATE HERE.