I'm talking, for example, about this: http://he-man.wikia.com/wiki/Snake_Clan. The Snake Clan is only in one Filmation episode and only a little of the entries content is from there. There are no sources for the other stuff mentioned and I don't find any when searching the web. It seems completely made up. This continues here: http://he-man.wikia.com/wiki/King_Jarod and here http://he-man.wikia.com/wiki/Government_of_Eternia as well as in several other connected entries.
I found this to be a very big problem as well, and I think some confusion stems from a failure to properly divide various storylines of the MoTU franchise.I t's hard to tell which timeline the page is talking about at times, much less if it is accurate.