Attack on Titan 1x04 Full Reaction

You probably realized this by now but they are only on the second wall right now. The titans only broke through the first wall in the first few episodes. A lot of people think they broke through two walls but remember their home town was a special city that sticks out from the main wall with a smaller wall around it. What you were seeing was the titans breaking through the smaller wall then the main wall. Only in this episode do the titans break through the second wall.