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Johnny Depp refused to appear in the film reporter Jason Stone.
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In the film, TV host Natalie Portman’s puppy is the pet of Lisa Marie, who plays the Martian girl.
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The military uniforms, tanks, jeeps, artillery and other equipment in the film are all from the 1950s.
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Tim Bolton used a real casino blasting scene in the film. After the filming, the area was converted into the parking lot of the Las Vegas Convention Center.
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Susan Sarandon was the first candidate to play Barbara Rand.
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Hugh Grant was the original candidate to play Donald Kessler.
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The producers had wanted to ask Meryl Streep and Stockart Jenning to play the first lady.
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Michael Fox suffered from Parkinson’s syndrome when he appeared in the film, so his left hand was visibly trembling when announcing the Martian’s arrival in Nevada.
Mars Attacks! behind the scenes gags
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[Martians have broken into the President's secret war room and Decker approaches them holding two handguns]
General Decker: You think you can do anything you want. You can't. Because we are human beings. And we have the United States Army that'll fight you to the last man! And we'll never surrender! Do you hear me?
[the Martian Leader uses a shrink ray to begin miniaturizing Decker who doesn't seem to care or notice]
General Decker: [voice rising in pitch as he gets smaller] We'll fight you on the beaches. We'll fight you in the streets. We will never, never surrender! We will win!
[Decker is now smaller than the Martian Leader's foot]
General Decker: Democracy will survive! We will never, ever surrender! We will win! The eagle will be triumphant!
[the Martian Leader raises his foot and crushes Decker to death]
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Gen. Decker: Screw the press! This is a need-to-know situation. We should make it a top secret, and we should move in right away with Defcon-4!