Steven Spielberg's Ready Player One is bursting with so many winks, nods, and references to all areas of pop culture that sometimes, even the people who created those things aren't aware they're in the film. Case in point, Ready Player One co-writer Zak Penn.
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From Back to the Future and The Iron Giant, to Akira and The A-Team, Ernest Cline's Ready Player One is absolutely jam-packed with pop culture references. However, despite the efforts of arguably the most famous and powerful director of all time, one kind of big property isn't in the movie adaptation.