Ernest T. Bass Joins the Army - S4-E3
Revealing mistake: When Barney picks Andy up and they get back to the courthouse, they find Ernest T. out of the jail cell again and breaking more windows, and in the shot of Ernest T. leaping in the air we see it's actually a flipped shot - note the backwards "snack bar" in the window. (That store is seen later when Ernest T. tries to break the new glass for the courthouse).