SANTA CLARA, Calif. – A review of four hot issues from the San Francisco 49ers' 23-13 win over the St. Louis Rams:Crabtree effect: The 49ers were waiting all season for standout receiver Michael Crabtree to return from a torn Achilles he suffered in May. When he came back Sunday, the 49ers were not disappointed. He caught two passes, including one that went for 60 yards, and his presence opened up routes for Anquan Boldin and Vernon Davis and made quarterback Colin Kaepernick a more productive player.