Crabtree moved toward the sideline following the preceding third-down play, giving the impression he was subbing out of the game. Crabtree remained on the field and escaped the Rams' detection at the snap. Akers threw to him for the easy score.
The NFL subsequently made deceptive substitutions a point of emphasis for officiating in 2012, leading to our discussion Wednesday on whether the Crabtree play would remain legal. I've checked with the NFL and learned the 49ers' tactics would not be affected.