We speculated about this during the game, but the turf at Levi's stadium WAS bad.

According to one observer, the turf at Levi’s Stadium was loose and coming up and might have been the reason for both teams suffering multiple muscle-pull injuries.
http://www.packersnews.com/story/spo...tion/89476046/

Crockett-shoulder
Elliot-hamstring
Banjo-hamstring
Dorleant-hanstring (second of camp, said this one is different)
Springs-finger (came into game with injury, got worse in game, staff put him in club)