Uzumaki made some adjustments too. Most of the work had been published, and it was way too much material. Plus the ending hadn’t come out yet, so they had to make it up themselves. I won’t say it’s a great movie-- more eerie and creepy than actually scary-- but as an adaptation, it was solid.
I haven’t seen a ton of anime or live-action movies, but of all the manga I read when I worked in a bookstore, Uzumaki was one of the best… so I watched the movie. 
Junji Ito’s terrific at horror manga!
