You projected disappointing results for “Speed Racer” as early as two months ago – and you were right, as it spluttered its way to a $20.2 million opening weekend (edging out “What Happens in Vegas” by a mere $200k). “Iron Man” dominated its second weekend by pulling in $50 million, but it will receive a major challenge from “Narnia” sequel “Prince Caspian.” Emanuel Levy had a tepid review, but still predicted major box office revenues.