Yeah, I'm just surprised people are willing to believe Nora's story, even if they ignore the possible holes (like having a way to return to the other side, but somehow keeping it a total secret). This show has been filled with a number of events that could be seen as supernatural, but I don't think any of them have been explicit enough to not have a possible natural explanation.
Kevin's poison could have not been actual poison. He could have been lucky and simply survived the gunshot. His visions could be explained as simple hallucinations or dreams or something like that. Jarden could have had actual departures that were covered up. Mary could have simply woken up. David Burton was probably just a regular dude. Nora never went to another side.
I think the only truly inexplicable event in the show is the sudden departure. For the other stuff, where do you draw the line on what you believe and what you don't? That's why I think any further explanation wouldn't serve the show in any way. It would defeat the point.