It is not a mystery, that BZ2 and Modder's data contain geometrical and animation errors, but it is better to check for errors and fix them by modeling. This video is showing how to make animation errors visible in Gmax (3ds Max). These errors are not visible in BZ2, because it plays whole frames. But there are game engines, which are able to play the frames as floats.
In this topic I want to share some methods for errors checking and fixing them. I hope you find it helpful.