Continuity mistake: When Hal is showing his friend how the ring works and has to "recharge" it, his grip on the lantern changes between shots. (01:09:45)
Green Lantern (2011)
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Directed by: Martin Campbell
Starring: Ryan Reynolds, Peter Sarsgaard, Mark Strong, Blake Lively
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Trivia: The plastic transparent jet that Hal gives to his nephew is a reference to Wonder Woman and her jet.
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Answer: In the comics Sinestro founded and led the Sinestro Corps, a group similar to the Green Lanterns, but they use the yellow part of the emotional spectrum: fear, rather the the green energy of willpower.