If the info is wrong on imdb update it there. When you see the change go live on imdb, then you can post here.
Please post an ICM link (preferably a beta link) and say what needs updating.
For now only post updates for the following:
* Incorrect titles
* Incorrect/missing years
* Incorrect/missing directors
* Incorrect/missing genres
* AKAs that show up as display titles on default imdb. See this post: http://www.icmforum.com/single/?p=10014693&t=8435382
* Duplicate Entries, post links to both.
You can post for runtime updates, but only if the runtime is NOT tied to a specific country.

If the runtime looks like the first case, with a country attached it will not work. Try to fix it on imdb if you like. If it looks like the second then it's fine.
We've fixed a lot of the most glaring ones, but there are probably still a lot, especially for unofficial and more obscure films, that need fixing.