How's this for irony? At press screenings of ''Shattered Glass,'' about the journalistic fabrications of Stephen Glass, the end credit for costar Chloe Sevigny is spelled Sevighy, and the punk quartet is simply Ramone. The best part? One screening was just for fact-checkers. Lions Gate promises the typos have been corrected for the movie's Oct. 31 release. Says the actress: ''They can misspell it all they want, as long as they still hire me.''