Continuity mistake: By the end of the movie, when Lucy is sitting in the chair and her skin turns black, we can see her arms slowly turning black as well. When camera cuts away and shows Lucy from behind, her arms are naturally white again.
Factual error: The idea that humans only use 10% of their brain is a widely-circulated myth that has been debunked by neurological science many times over.
Trivia: During Lucy's final transformation sequence, her consciousness starts traveling through time by millions of years. At one point, Lucy pauses in time to observe and interact with an ape-like creature, reaching out to touch its fingertip. Although not expressly stated or explained in the film, this ape-like creature was what scientists today classify as Australopithecus afarensis, the earliest identifiable ancestor of humankind. The first fossils of Australopithecus afarensis were determined to be from a female who was christened "Lucy" by scientists.
Trivia: Near the end, as Lucy starts travelling backwards in time, she pauses in various periods of Earth's natural history. However, after she travels all the way back to the age of the Dinosaurs (at least 65 million years ago), she inexplicably travels forward in time by about 60 million years and meets an Australopithecine, one of humankind's earliest ancestors (that lived around 4 million years ago). She then resumes traveling backward in time to the beginning of the universe.
Lucy: Ignorance brings chaos, not knowledge.
Professor Norman: We humans are more concerned with having than with being.
Lucy: We've codified our existence to bring it down to human size, to make it comprehensible, we've created a scale so we can forget its unfathomable scale.
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