Continuity mistake: When evil Superman crushes Clark's glasses, they swap around 180ยบ between shots.
Continuity mistake: The tornado in Colombia blows out some candles, but they all appear lit up again a shot later.
Revealing mistake: When Vera is reading the Time magazine, it's missing the date and price on top of the letters, revealing it's a fake cover.
Continuity mistake: When Gus flies away with the skis, the sky keeps changing from cloudy to sunny all the time.
Answer: There were rumors that Hackman was angry with the Salkind Brothers (the producers) for firing director Richard Donner, though Hackman later disputed saying that. His explanation, though he may have been downplaying the real reason, was that he had a number of other movie projects at the time, and he also did not wish to continually play the same villain in an ongoing movie series.
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