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Fans of pop culture have undoubtedly watched the adventures of Marty McFly and Doc Brown countless times before. They’ve pored over each time Michael J. Fox’s quintessential 1980s teen travels back in time to 1955 in a souped-up DeLorean created by Christopher Lloyd’s bumbling mad scientist. They’ve memorized all the lines in director Robert Zemeckis and co-screenwriter Bob Gale’s indelible (and Academy Award-nominated) script. But they might not have noticed these tiny details, which you should look out for next time you watch Back to the Future. 

1. DOC BROWN’S CLOCKS ARE ALL PERFECTLY SYNCHRONIZED.

 

UNIVERSAL PICTURES HOME ENTERTAINMENT

Look at the clocks in Doc Brown’s garage in the opening scene and you'll notice that they're all set 25 minutes behind. One of the clocks features a man hanging from its hands, an allusion to silent comedy star Harold Lloyd’s famous scene from the 1923 film Safety Last. It also foreshadows the later scene where Doc hangs from the Hill Valley clock tower in the same way. Unfortunately the similarities stop there: Christopher and Harold aren’t related.