I guess no one's read Jon Ronson's latest book, So You've Been Publicly Shamed. There's a chapter on the Zimbardo prison experiment in which Ronson interviews a couple of the key figures and casts a lot of doubt that the experiment unfolded the way it's been told for these many years. IF you believe the people he interviewed, which includes the main "prison guard" bully, there was a lot of play-acting going on. Ronson cites academic psychologist and textbook author Philip Gray's argument that the experiment was flawed because Zimbardo awarded himself the role of superintendent, especially since he gave the guards a pep talk about their total power in the situation (as recounted in Zimbardo's own book, The Lucifer Effect).
That does make me wonder about the quality of Zimbardo's research on this occasion.