Well, your edits to the reference section would be considered trivia, but we do not normally add trivia from something that is out of the universe of Kung Fu Panda. Sorry, I should have left an edit summary.
I still haven't gotten around to creating a Manual of Style so there aren't any confusions like this, but there are some exceptions to the trivia. We do add some out-of-universe trivia as long as there's either (or hopefully both)
a credible source, or
an obvious direct correlation. (In this case, we also usually add something around the lines of "Though unconfirmed..." to show that there isn't an official source that directly credits the correlation.)
In the case of the Pai Mei article, it seems obvious enough (to me, at least) that the character was most likely inspired by the Kill Bill character - which also has some extra credibility because it's a film that pays homage to martial arts. The same thing happened with the Lu Kang character, which is why we have out-of-universe trivia on him. So I went and added the info back into the article.
Just as a counter-example, here's what isn't an exception: We keep rejecting the trivia that says Tong Fo talks like Christopher Walken because there is neither a source nor a strong enough direct correlation. Sounds can sometimes be misleading (especially in voice acting), so any kind of connection it may have isn't obvious enough. But written names and most images cannot mislead, and therefore have a stronger correlation.
Sorry again for the confusion. This kind of specific detail with this wiki's articles isn't written down anywhere yet, and I take the blame for that...
In case the topic title wasn't obvious enough, I'd like to offer you rollback rights on this wiki. :) You seem to be pretty persistent in undoing vandalism around here, and just from what I've personally observed from you, you also seem to be a sensible, non-conflict-seeking user—which are all valuable traits I look for with any wiki position. And I can always use more rollbacks to help with spam and vandalism, regardless of the amount present on the wiki.
If it affects your decision on accepting or not, I just want you to know: there's no (intended) pressure or stress with this. I just thought you'd like a faster way to undo edits. (If you're not sure how this works, look at the page I linked to above in "rollback", or just ask me about it.) I also don't expect commitments, change, or anything else different out of you than what you already do; just keep on doing what you're doing, and you're free to stop or withdraw from the position whenever you feel like it. :)
So feel free to accept or decline as you wish; I'll be satisfied with your answer either way. Let me know if you have any questions. :)