Here is the internal wiki used by developers of Kentucky Route Zero to collaborate. It contains:

• Official interpretations of themes and narratives
  
• Character and overworld design notes
  
• Sources of inspiration
  
• Cut content: Scrapped scenes, locations, plot lines, etc.
  
• And countless fascinating and behind-the-scene tidbits!

https://github.com/dekuNukem/Kentucky_Route_Zero_Official_Developer_Wiki

An example is that in Act 5, Julian's flying overworld interface was supposed to make a return [photo 32], and none of the actors show up for Carrington's play, so Conway and his Companions have to perform the play themselves [photo 33]. Compared to the relative short length of released version Act 5, it does look like some contents were cut.

Anyway, it's a fascinating read from an official source, and an invaluable resource for analyzing this masterpiece of a game. Hope you find it useful.