This is marvellous! I was also doing some comparisons in my head, but im definitely planning on rereading the novel after finishing the series.
I did notice one major thing - RNZ in series is a LOT cooler than he is in the novel, although him in the series also has some mischievous moments with LJS which was absolutely adorable.
Also i like that they filled in some unexplained things in the series, makes it a lot more coherent and easier to understand. They were also very considerate with scaredy-cats like me and toned down the scare-factor by a lot haha