Good points. One correction though, I believe it was Bela Lugosi who died before production and not Boris Karloff. Both of them were endearing creeps though.It's playing on TCM this month. Last Friday night they did a 90 minute script read of the movie and then followed with the movie. One of the details of the movie was Boris Karloff died before filming started so they used his wife's chiropractor as a fill in. He played a zombie vampire so he covered his face with his robe. Also, the main female zombie vampire, that looked like Elvira, had a freakishly small waist. It felt like she should split in half at any second.
