Visible crew/equipment: When Superman cries "Don't do it, the people" a boom mic is reflected on the glass behind.

Superman IV: The Quest for Peace (1987)
21 visible crew/equipment mistakes - chronological order
Directed by: Sidney J. Furie
Starring: Gene Hackman, Christopher Reeve, Margot Kidder, Jackie Cooper, Marc McClure
Revealing mistake: After Nuclear Man destroys the cab's hood, the shot changes and there's a thick string running behind him all along the car, and the cab driver is stretching out to pull it. Probably he was activating some sort of bad FX.
Superman: You'd risk world wide nuclear war for your own personal financial gain.
Lex Luthor: Nobody wants war. I just want to keep the threat alive.
Trivia: Christopher Reeve originally refused to return for this film as he hated "Superman III" so much. He eventually changed his mind when he was given more input in the script.
Question: I read that, according to Margot Kidder, when working on this movie, Christopher Reeve and Sidney J. Furie didn't get along at all. Is this true? If it is true, then what was the reason behind their feud in the first place?
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Answer: There appears to be multiple reasons. They had creative differences, ultimately resulting in a poorly received movie. Kidder said Reeves, who co-wrote the story, had an inflated ego and clashed with Furie.
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Moreover, Mark Pillow, who played Nuclear Man, claimed that working with Reeve was quite intense.