Wait, who was really meanest girl in “Mean Girls?” According to Lizzy Caplan, who played Janice Ian, it was not Regina George nor was it Cady Heron. It was maybe, possibly Janice, whose outcast character wreaked havoc on the lives of others. She was just trickier about it. BuzzFeed recently checked in with the “Castle Rock” about the cult favorite film and asked if she thought a viral Twitter thread about Janice’s evil ways was on target. “Yeah, of course!” Lizzie replied to the outlet. “But she was way craftier than the other mean girls. She was a mean girl with spy plans — with purpose!” Look, even teenagers know it’s good to have goals …