Ok, just thinking out loud, but here goes;
Shaz, Ray, Chris all dead and in limbo of some sort. Maybe some force is deciding whether they should go with Keats or Hunt.
Chris's death something to do with the whistle and violence/lack of compassion which is why he had his 'moment' last night.
Shaz' death some sort of stabbing. When the gang approached her she kept looking at their hands. I think possibly a tool maybe screwdriver as she freaked out at one on her desk the other week.
Not sure about Ray. I can't remember when he had his 'moment'.
I think they all died partly because they didn't stand up to authority. Not saying that caused it but one resulted in the other.
I think Sam and Alex should be dead which is why they're there but because they're not quite dead they have retained consciousness from their real life. (if that makes sense)
I was wondering whether we were going to have an old photograph moment like in 'The Others' were Nicole Kidman finds an old photo clearly from a different era showing the people she has been employing in her house ie they're dead and died a long time ago.
I really don't know about the dead cop with his head blown off. I keep thinking next week one of them is going to be shot/killed and it will their body which will be found in 2006. But whether that boy is the dead cop is something I don't know.
I do think it's significant that last night Shaz said, 'Your minds are stuck in 1953' as the dead cop and the photo of him look very much of this era.
Ok, rambling now!