A thought occured to me on the last episode...(spoilers)
I would have to rewatch it to pad out the thought some more, but is it possible that Kevin, Nora and Laurie are all in some other dimension because they all chose to go to their deaths?
We don't know if Nora was telling the truth about seeing her family again or even that Kevin attended her brother's funeral and spoke with his dad, other than the stories they both tell.
They are the only three that chose to end their lives for whatever reason are the only three that we see in the final episode. Just made me wonder if something was missed there because of that.