Trivia: Annette O'Toole, who played Lana Lang in Superman III, plays Clark Kent's mom on Smallville.
Trivia: Richard Pryor originally turned the film down because he thought the script was rubbish. He admitted he only accepted the role because he was offered five million dollars for it.
Trivia: This is the only movie of the series where Lex Luthor doesn't appear nor is mentioned.
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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