Walter's King of Cups card is a tarot card. Interpreting the King of Cups really depends on which source you favor, but one we found might allude to Olivia's relationship with John Scott.
The King of Cups does not repress his emotions and unconscious impulses but has learned to accept and deal with them in a mature and balanced manner. -- biddytarot.comMost notable however, the face of the king is covered (or scratched out?) by a bird dropping?
Among a few crime scene photos of the elevator crash are two feathers, presumably those of the pigeons responsible for the mess. Also seemingly out of place, what appears to be a childhood art project "By: Peter!!"
There is also a diagram of the device used to reorient the pigeon's internal compasses so they could home in on Joseph Meegar's location.