Man of Steel tips its cap to other super heroes, as evidenced by this homage to Watchmen.
And in turn, the Watchmen film features subtle nods to Batman. Did you catch them?
Speaking of Batman, did you notice the connection between the Joker's iconic mask during The Dark Knight's opening bank robbery scene and the one used in the 60s TV series?
In Raiders of the Lost Ark, you can spot hieroglyphic drawings of characters from a galaxy far, far away: C-3P0 and R2-D2!
Pixar seems to have created one great big interconnected world. For instance, did you know you can find Nemo in Toy Story 3?
But Toy Story also ventures outside the Pixar family for inspiration. For example, the carpet in Sid's house might look eerily familiar... it's the same pattern used in The Shining!
Alfred Hitchcock movies frequently featured cameos from... Alfred Hitchcock!
Did you know that parts of Hans Zimmer's Inception score were inspired by Edith Piaf's song Non, Je Ne Regrette Rien?
Oh yeah, and that Mexican restaurant in Anchorman? It's name translates to "We spit in your food."
Clues suggest that Iron Man - or rather Tony Stark - was working on a prototype shield for fellow Avenger, Captain America!
In Peter Jackson's King Kong, Jack Black gets a morse code message on Skull Island. If you translate the text, it parodies a famous Jerry Maguire line: "Show me the monkey!"
Trailblazing sci-fi film Tron features a cameo from an 80s arcade classic: Pac-Man!
Another ode to gamers: it appears Wreck-It Ralph's Game Central station was tagged by the infamous, trigger-happy World of Warcraft player Leeroy Jenkins.
As an Easter Egg aficionado, JJ Abrams hid the DHARMA Initiative logo from Lost into the opening of Cloverfield.
And apparently it's impossible to find a scene in Fight Club that doesn't have a coffee cup.
Comment with any hidden gems we might have missed.