If a computer got powerful enough, then it will beat a human chess player, and it did. Perhaps I wouldn't have predicted this, but this was a very reasonable prediction, that many could have made easily without his insightful knowledge on law of exponential growth. .
Another prediction he made is that value of commodities will decline, and new wealth will be created in the knowledge content or rather information, leading to economic growth and prosperity. This is certainly true now with the internet, and the information the internet collects from us, is probably most valuable, and will continue to be so, as long as the internet grows. However, was this something a 12 year old could have predicted? Well, perhaps not, but with the number of Intellectual properties increasing, and perhaps with prior knowledge that an internet boom will occur, I think many would have predicted this. Another thing we also have to look at is that the price of real estate, a commodity that is certainly not a knowledge content or information, has skyrocketed and is still rising. Whether this will continue or not, is anybody's guess, but if it does, this will put a little damper on Kurzweil's prediction that value of commodities will keep declining. .
He also predicted that a worldwide information network linking almost all organizations and tens of millions of individuals will emerge. He was dead-on right on this one. In 1995 the internet was privatized and the World wide web was born, and the rest is history. Again, if you were someone working in the NSF, or were part of ARPANET, then you could easily have made this prediction. But again, we have to give him some props were getting this right.
He predicted that the vast majority of commercial music will be created on computer-based synthesizers. This is also very true, but I think lot of people were already doing this back in the 80's. It was a very logical transition.