What cast change was there...I didn't notice anything other than preacher being on a planet rather than on the ship...I loved the preacher role BTW. My favorite line in this series has always been when preacher tells Mal that he is "going to a special place in hell reserved for child molesters and people who talk at the theatre.." That whole seen was hilarious and Ron Glass was an excellent choice for that role.
MarkL was referring to what happened to some cast members in the film... Thus they would not continue on in a series set right after the film.