I'll probably be able to dig something up on werecats...
I'll look into were-lions of Africa, the Tsovo maneaters (I read on a site that some believed them to be reincarnations), jaguar warriors, the Mayan jaguar-growl instrument (Here, only stringed instrument in Mesoamerica), were-tigers...
That said, while I'm happy to help, I don't see how having a large variety of myths about shapeshifters right at the beginning of the documentary is going to be that helpful.
"If you are worthy of his affection, a cat will be your friend but never your slave. He keeps his free will though he loves, and will not do for you what he thinks unreasonable; but if he once gives himself to you, it is with absolute confidence and fidelity of affection." -Theophile Gautier