2) “Your Doomsday”
Thanks to the spoiler-heavy trailers, not many fans were surprised when Superman’s nemesis Doomsday turned up for Batman V Superman’s final act. While the brute isn’t really given a name, Luthor references his usual moniker by telling Superman that he is “your doomsday.” Just as in the comics, the monster goes on to kill the Man of Steel.
Though his usual status as an ancient Kryptonian abomination is referenced, Doomsday is here retooled as a genetically-altered version of Superman’s fellow Kryptonian, General Zod. In this way, it’s a closer origin to the one from the Justice League Unlimited TV series in which he’s a deformed clone of Superman.
Speaking of the influence of animated adaptations on Batman V Superman, at one point Alfred calls the White Portuguese that Bruce is hunting for a “phantasm.” It might be a coincidence, but this calls to mind the titular character from 1993 animated movie Batman: Mask of the Phantasm.