I didn't follow it from the start, but the last episode was clearly trying to send a "it wasn't all just hallucinations in a coma" message.
I have seen a fairly convincing argument that it made more sense if both the 70s and modern sections of it were being run as simulations on some future computer, and programming bugs were allowing leakage between the two because the same character was being used in both. Which is clearly SFnal, if not what the writers intended.
There will be a new series with a different time-shifted character.