Movie In-Jokes: Man of Steel

One of the fun games when watching movies is to spot references, secret messages and gags that filmmakers, film crews and actors can slip into movies to pay tribute to films they love, have a bit of fun with their previous work, or give the cinematic equivalent of a shout-out. Here's a spotter's guide to these inside jokes.

This time, some set decoration hints at a future encounter for the last son of Krypton in a nearly subliminal image hidden in Zack Snyder's divisive Man of Steel from last year.