Yes, I mentioned two of them in another post in this thread ... the easy ippons and quick standups. You could also add the current 5 minute matches where they used to be 15 minute matches ... none of these changes were for the better.
But as far as I know no techniques were banned by the IOC. Judo has banned a few techniques since its become an olympic sport, most notably kani basami (scissor throw) and diving variations of uchi mata and seoi nage. But the IOC had no part in the banning, they were taken out by the IJF because it was felt they led to too many serious injuries (knee for kani basami, spinal for the diving variations).