Maybe he watched the movie "The Conversation" from Coppolla and thought it was a good idea to rip the wallpaper and try to find all sorts of listening devices on his wall? It was interesting to me because it was SO similar to the ending of "The Conversation", but it's probably just something a schizophrenic person would do on their own without any outside influence..
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Edit: Btw, movie recommendation to
@Null
Even though it's in the 70's, it shows how advanced surveillance was at that point in time, to the point where you could listen to two people having a conversation in a park with a bunch of people around them, so despite being technologically "outdated" it just makes you wonder how much more insane the technology for mass surveillance is now.