Post by waysoftheearth on Mar 12, 2015 15:54:47 GMT -6
The short version is: the errata are mostly minor clarifications plus a few corrections to "regressions" since V3. The most significant of these are possibly the corrections to HD of wolves, weasels, and boars.
The longer version is: there have been two versions of the Ref Rules Compendium available thru Lulu's POD service.
Beginning September 2014 the Ref Rules Compendium V4 was available. Unfortunately the content just so happened to expose some "frustrating" post-script support issues with Lulu's US print partner.
Beginning November 2014 the Ref Rules Compendium was updated to V4a to workaround these post-script issues. V4a also integrated the known errata as of that time.