Zach Galifianakis plays strongly against type as Riggan’s manager and the rare voice of reason in the middle of all this madness. Emma Stone is adorable as Riggan’s world-weary, wise-ass daughter who also serves as his assistant. (She and Norton have crackling chemistry in a couple of crucial scenes.) Amy Ryan does wonders with her brief screen time as Riggan’s ex-wife; she fleshes him out and allows us to see both the selfish and the good in him. And Naomi Watts, who starred in Inarritu’s wrenching “21 Grams,” gets to play both light and heavy moments as a neurotic fellow cast member.