When Perry is talking about his son Jerry he references the quote "you reap what you shall sow" but he says it backwards, "you show what you shall reap."
Superman is faster than a speeding bullet so when the bullet was fired at him he should have been fast enough to get out of the way even without a shouted warning. Yes it was a kryptonite bullet but it wasn't close enough to him ahead of time to weaken him or slow him down.