It is possible to possess a chicken... however, your just along for the ride, and if for some chance you happen to get 'eaten' by one of your minions... that's it... the controls lock up and... well... for all intents and purposes, you might as well re-boot the game... no ability to quit... no ability to save... you're 'dead'!
Concerning multiplay : I've noticed that it is not possible to turn off CD music at all... even with volume at minimal, the CD continues to spin... not a HUGE issue but for a game of this magnitude, every little bit of processor speed helps.
Know about a bug? Send me the info and I'll post it with credit to you...