ZSJL - Behind-The-Scenes Zack Snyder talks on how there is so much source material, and how canon can mean something different to everyone. In an interview with DailyPlanetDC, he talks about how he decided what to mine and what to create from the comics! “A lot of what I use as canon is more classic and well-established, but we also look to writers we really liked. In addition to Jack Kirby’s classic work on the New Gods, we looked at Grant Morrison’s and Alex Ross’s takes on the Justice League”