The 2011 sci-fi novel “Ready Player One” is chock-full of pop-culture references, from “Dungeons & Dragons” to “Blade Runner.” Steven Spielberg’s packed his movie adaptation with the same, focusing largely on beloved callbacks from the ’80s and ’90s. While some of those shout-outs play key plot roles, other Easter eggs are half-second cameos that go by in the blink of an eye.

Big or small, here are 10 references to watch out for.