Richard Donner, the director of Superman, was originally hired to make Superman II. He had made over half of the movie before being fired. Richard Lester was hired to complete the film. So, Superman II contains footage from both the Richard Donner version and the Richard Lester version. See more...
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The entry you are changing the wording of is:
|Original entry||When Ursa blows the helicopter away, the string holding it is visible.|