While playing through the game I noticed quite of few references to a very well known things in the game like Terminator, Blade Runner, Matrix, Mortal Kombat, Portal, etc, however after a pretty interesting moment with the Johnny's ghost I saw on the minimap that there is a Taro card on the tower, so I decided to climb it to collect it and noticed writing "Здесь были Киса и Ося" which is I believe a reference to the famous Russian novel https://en.wikipedia.org/wiki/The_Twelve_Chairs

With all this I do wonder if there are some other Easter Eggs in the game that are culture specific and might be missed by people not familiar from other cultures.