THOSE old “creative differences” are to blame for director Peter Jackson‘s firing of Ryan Gosling from “Lovely Bones.” “Peter couldn’t stand Ryan,” said one source. Though Variety reported that Gosling had “stepped down” and was replaced by Mark Wahlberg, our source said, “Ryan cut his own hair, and was fighting with wardrobe. He was so demanding . . . Peter booted him two days before filming started.” The flick is based on the best-selling novel by Alice Sebold. A rep for Gosling did not return calls.