Have to see this again--long overdue for a another viewing---the buffalo stampede scene alone, that you mention :-). Arguably, Depp's best performance. Gets very moving as well, towards the end with the Lagosi dying, etc.
There's some kind of retirement home for old stars...I remember hearing about it. It might be the Lillian Booth Actor's Home. I just remember thinking it was interesting...actors need retirement care, too. Bela was one of them that needed a place like this.