What a great end to the series. The stakes were high, Arnold reunites with his parents and Arnold and Helga finally confess their feelings for each other. My only critique is that the other kids, Arnold's grandparents, and Helga's parents seemed to just disappear in the middle. That and the tone of some jokes. Hey Arnold is a grounded show and is pretty realistic, so the thing with Abner hitchhiking, and riding first class feels out of place.
I really loved the animation. They've greatly improved on digital compositing, and it looks much better than season four and five. It looks just as lively as the first three seasons.
My personal synopsis: I'm not the most energetic or enthusiastic person you'll ever meet, but that doesn't mean I can't have fun. Generally, I'm pretty introverted and usually play video games, watch anime, and also study in the field of IT. I'm a huge music fanatic, as well. And I listen to pretty much everything except country. My favorites being trap, jazz, and metal.