I think they scored a Touchdown in the 1st quarter. Granted, their only one by the offense for the game. They had an interception returned for TD in the 3rd, and added 3 field goals -- 2 in the 4th quarter.
So, no matter how you slice it, their offense was really not that good = 16 points, one decent drive, and the 3 drives for FGs (each drive around 50 yards). In reading the recap, more Rams mistakes than anything special by the 49ers.