15. Keep Calm...
Man Of Steel is pretty chocked full of Easter Eggs, from Snyder's references to 300 and Watchmen through to the many Superman Universe references like the appearance of LexCorp and Waynetech logos, but the funniest, which ranks as as much as an in-joke as it does an Easter Egg is the sneaky addition of a Stay Calm & Call Batman poster in the background of the scene above. Snyder confirmed that an effects company employee added the Egg without his knowledge, but given the subsequent revelation of the sequel, it seems odd prophetic, especially as it seems to have underpinned the logic of bringing Batman into the sequel to "save" the franchise.