Revealing mistake: In the episode "Identity," in the scene where Cooper takes the homeless man's photo on his iPhone, if you look to the bottom left of his iPhone's screen where it shows pictures that you have already taken, you can see that the homeless man's photo has already been taken, indicating that perhaps this scene was shot a few times, and the photos taken during those scenes were never deleted.
Trivia: In 2014, the series creators and network were sued for emotional distress by the family of a man named Andy Abarca. Abarca had been killed in a shooting, and actual photos from his autopsy were used in the opening credits montage of the show, evidently without any permission from his family. His mother and sister just happened to stumble across the show on one night in 2013 and were greeted with grisly images of their deceased relative. It was evidently allowed as autopsy photos are considered public documents. As of 2018, there have been no updates on the case.TedStixon