Evolution in animation (Niceklodeon version)
I thought the Nickelodeon version had an interesting evolution in animation. Here are my thoughts on the animation in the original show over the years:
Season 1/pilot: The original "Doug Can't Dance" pilot was animated strictly by Jim Jinkins' Jumbo Pictures, and it shows. It was famous for its incredibly sketchy animation that Doug was originally identified by. While not the best animation ever, it was good for the time.
When the show was picked up by Nickelodeon, South Korean studio HanHo studios was hired to do the overseas animation, and they did a great job. Not much to complain about here. Solid. For the record, HanHo studios handled the overseas animation for the entire Nickelodeon run.
Season 2: As much as I liked the episodes from this season, I really HATED the animation here. It turned out that Jumbo/Nickelodeon hooked up with French outfit Ellipse Programme (who was also around for the last two seasons), and for some reason, Ellipse saw it fit to telecine all the episodes to 25fps (PAL/SECAM). Awful! I despise PAL/SECAM!
Season 3/4: It was in the last two seasons that I thought they finally perfected the animation, and not only that, but thankfully Ellipse telecined all episodes from those final two seasons to 23.976fps (NTSC).