I'm currently in chapter 2 and noticed by chance that the upper left corner gives access to a phone.
opening the first messages screen throws the error "Could not find font u'Abel-Regular.ttf'", but after adding the font to the game directory one can only read "This is first message from aoibheann", looks more like some kind of dev experiment?
and changing the background image gives the error 'jade_wallpaper2 not found' (but hey, no exception ;))