I'm glad I read the manga after watching the anime. The ending was so much better in the manga, in the anime it felt more rushed and unsatisfactory. Also, the final confrontation in the anime was way too direct after the whole cat-and-mouse detective game playing through the entire story. Yashiro-sensei acted pretty out of character there too.
Besides that, they just skipped explanations like the aftermath and reasons of survival of the car crash in the frozen water. That was a bit akin to getting a kick in the nuts, saying "invent something yourself". Glad that got resolved in the manga.
All in all, a great story. Definitely worth the read.