In the oddly punctuated "Birdman, or (The Unexpected Virtue of Ignorance)," Michael Keaton plays a Hollywood has-been named Riggan Thompson taking one last stab at seriousness as a Broadway hyphenate, pouring the last drabs of his comic-book movie fortune into a Raymond Carver adaptation and watching - with half desperation, half resignation - as it threatens to crumble before opening.
