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 in-joke casts the two collaborators responsible for a science fiction classic into a more combative relationship in this clever bit of prop design for 2010: The Year We Make Contact.
