Factual error: When Superman is turning back time by flying around the Earth, right before he starts orbiting the Earth is spinning way faster than it actually should be. If the Earth actually spun that fast, a day would pass by every 1.44 minutes.
Superman (1978)
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Directed by: Richard Donner
Starring: Gene Hackman, Marlon Brando, Ned Beatty, Christopher Reeve, Margot Kidder
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Trivia: Jeff East, who plays teenage Clark Kent, was dubbed over with Christopher Reeves' voice. The only time Jeff's actual voice is heard is when he shouts in excitement after jumping past the speeding train.
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Answer: He wanted to see for himself if the stories were true. Some reporters tend to exaggerate the facts and if he had any other weaknesses. He couldn't be sure the kryptonite would work.
While I don't exactly disagree that Lex wanted to see for himself how invincible Superman is, I don't think that's the main reason why he did it. The bullets and fire were simply a charade to make it look like this was his security system. Keep in mind, he wanted Superman to enter his lair because the real trap was the Kryptonite that he had in the lead box.
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