Superman III (1983)

Question: When Ross Webster is talking to his accountant Simpson, he wonders how $85,000 disappeared. Wouldn't Simpson be able to see all the payroll checks to see that Gus had two of them if he dug deeper in his investigation vs. both him and Ross seeing Gus pull up in a shiny new Lamborghini and outing himself as the thief? I realise Simpson isn't a fan of computers as this scene has established, but all he would have had to do was talk to the payroll clerk about the two checks that were presented to Gus when they were handed out, assuming no-one else had two checks with two vastly different amounts in them. (00:28:39 - 00:30:42)

Question: How come Superman is so nice to Gus at the end? He was working with the baddies, he created a computer and the Kryptonite to kill Superman! Yet Superman is totally cool and even asks the coal miners to give Gus a job. Did I miss something?

Question: When Gus is eating at a diner, he overhears a man telling another man that somebody is making money off the oil shortage. How?

Question: Since kryptonite obviously doesn't come from Earth, how can Earth elements be used to create a synthetic version? Like in "Man of Steel", when Jonathan says that the Krypton key wasn't made from anything on the periodic table, so it couldn't be from Earth.

Question: In the original Superman television series, Superman created a duplicate of himself so that he could be in two places at once. However, as one went to pull the bars out of the wall, he had to have the other help, as the strength of one was half that of the original. That said, how is it that both Clark and Evil Superman have the same strength of the whole being after being split?