20 Million Miles to Earth (1957)

Dr. Judson Uhl: I've had nightmares in my time, but I've never dreamed of anything like this.

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[on the plan to capture the alien creature with a huge net]
Col. Robert Calder: Doc, this is like a parachute. It's got to work the first time!

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[last lines]
Dr. Judson Uhl: Why is it always, always so costly for Man to move from the present to the future?

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One of the reasons the film takes place in Italy is that Ray Harryhausen always wanted to vacation there but could never afford to go on his own.
The Ymir roars in the film are variations of elephant roars sped up and modulated in pitches at different rates.
Since he planned to use a real elephant for some of the footage in the zoo, Ray Harryhausen asked for one that was 15 feet tall, but the film was only able to procure an eight-foot-tall one for him. In order to make the elephant look much bigger, a 4'6" actor was cast to play the zookeeper.
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