Doing It for the Art: A lot of attention has been paid to the details in the game. All posters look real (the visuals and the words on them are legible), and the throwaway details are cared for. For example, a maintenance chart in the boiler room in the early Sinister Subway level is filled out with workers' names, dates, etc. The same graphic is never used again.
Word of God: An interview with the creator months after the Japanese release revealed there are two Shins - one is an AI copy of the real Shin, to which the other is Seto's grandfather, the old man whom he was living with.
Shrug of God: However, the creator himself isn't entirely sure about a few things.