How dependent on having the players be from the Occult Adventures is this Bestiary?
I'm not sure I get your question. Several monsters have spells from the Occult Adventures hardback, so a GM will need access to that (or the free online version). But the player characters? They don't need to use anything from Occult Adventures to get the full experience from the monsters in this book.
I'm curious about the Prana Ghost's alignment... and if we'll ever get non-evil undead, especially a non-evil undead PC race (no, not dhampir).
The prana ghost is a template with no alignment restrictions. The example creature is neutral good, but the template description is careful to point out that evil creatures can become prana ghosts as well.
Oh, and prana ghost is a misnomer - they're actually outsiders with ghost-like traits.