I love how they depict an afterlife that is completely like real life in every way, right down to people dying in it. Wait, no, that's stupid.
Also, being the afterlife completely negates the nuclear explosion having f*** all to do with causing the flash-sideways, when they blatantly indicate that that's what caused the whole thing. Unless there was no afterlife before people detonated a nuke on the island.
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"One toot on this whistle will take you to a far away land."
-Toad, SMB3