Lindsay Lohan kept an opening night audience hanging on her every word, in part to see if she’d forget any, as she made her stage debut on Thursday night in a West End revival of “Speed-the-Plow”, David Mamet’s scathing satire of Hollywood. By the closing curtain, Lohan had proved she could hold her own with two top-notch male actors. Richard Schiff, best known as Toby Ziegler from “The West Wing”, played producer Bobby Gould.