SPOILER: I was thinking about the 'old evidence'.
The "evidence pictures" that the conspiracy theory guy had really proves the father of the main character right when he say that the game nowadays isn't what it used to be. The assassination of JFK, boy, that's a quite grand task right there.
Which made me think about that particular task. It should mean one of two things. Either the killer of JFK was a relative of his, or that this mission was lower on someone's list than no:13. Now, it shouldn't have been someone's no: 13 task since anyone related to JFK would have a better chance of succeeding in killing off ANY other family member than the freaking president of the United states (unless of course, this person happened to really hate JFK). So, if killing the president was somebody's 1-12 task, the game was quite more hardcore back in the days compared to the things the main character in the movie was asked to perform, hehe.