The movie one I made myself. Someone in an FB group I'm in posted one for another movie, and it inspired me to make one. I just used the same format.
As for templates, I'm pretty sure not even all the ones you can use on imgflip are "pre-approved". I've uploaded a few templates for others to use, and they show up on search, but if I go to someone else's meme using one of them, it doesn't have a "Re-caption this meme" button. (mind you, only one of them has been used at all, so far)