Continuity mistake: In the big fight scene, Roddy Piper and Keith David are wrestling and struggling about and land so the black guy's pants are getting soaking wet. In the very next shot as the fight continues, his pants are dry. (00:58:55)

They Live (1988)
Ending / spoiler
Directed by: John Carpenter
Starring: Keith David, Meg Foster, George 'Buck' Flower, Roddy Piper
Nada (Roddy Piper) is killed but before dying he manages to destroy the transmitter dish that disguises the true appearance of the aliens and their disguised messages/propaganda. All the humans start to notice the real appearance of the aliens.
A.J.
Trivia: Roddy Piper and Keith David decided to fight for real, only faking the punches to the face.
Question: How does wearing the sunglasses allow the wearer to hear the speakers broadcasting the "sleep" command?
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Answer: It affects the brain waves. Wearing those glasses disrupts the visual and audio signals.