The world we live in was originally Dark City, and John Murdoch was literally GodWhat was the very first thing that John Murdoch does? Creates water, and the sun, just like in the Bible.
Centuries later, everyone in Dark City gained the ability to Tune in different amountsAs they subconsciously expanded their small world, gradually their lost memories of Earth and created new creatures based on popular culture and explained their powers as magic. At some point, the entire flat planet became dependent on Tuning or "belief" and "magic". And later, [[Literature/Discworld four elephants and a giant turtle]] were created to support the expanded Dark City.
John woke up not because of his power, but because the memories are incompatibleAt first, the implication seems to be that John's waking up during his imprinting is related to his ability to tune—but it's mentioned that other people have awoken during the midnight tuning, most notably Walenski, and there's no indication that any of them are capable of tuning. It's also mentioned by several characters, not to mention John himself, that he's simply not capable of being the murderer that he was supposed to be. What if he woke up because his mind was rejecting the memories of doing things that he would never do—and the same problem has been occurring sporadically all over the city?
Emma was originally Marion from Requiem for a DreamAfter the events of the film she was abducted by the Strangers and forgot her former life and drug addictions. A hint of this might be the fact that she is seen standing on a peer with John watching (she was doing this in Harry's imagination a few times in RFAD)
Everyone got sunburn.In the dark for years and then John turns it towards the sun? Ouch.