Factual error: The supercomputer has the British spelling 'Defence' written on it, instead of the American 'Defense', even though the movie takes place in the USA.
Factual error: When Richard Pryor is working his job in the computer room his boss walks up behind him and is amazed at a program that Pryor has written. The boss asks how he did it; Pryor answers that even he doesn't know. Look at the computer screen - Pryor's amazing computer program is just a bunch of worthless print commands that print sentences onto the computer screen; it serves no real function whatsoever.
Factual error: At the start we see a blind man and his guide dog, who runs off after a smaller dog. Guide dogs are specifically trained not to do this before being given to their owner.
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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