This is a interesting interview with film critic Michel Ciment, that links many symbols through Kubricks body of work exposing the pizzagate themes long before many eyes were open.

Here's a couple of links to the video

https://www.youtube.com/watch?v=28IvY7F1n-I

http://torontofilmreview.blogspot.no/2013/07/kubrick-illuminati-by-laurent-vachaud.html