What's the funny joke?

A film crew is filming outside the village. During the intermission, a group of actors who played Kuomintang officers and soldiers went to the village to find a toilet without taking off their clothes. At the village entrance, they met an old farmer and asked him about the toilet. The old farmer shook the actor's hand excitedly and said, when did you call back? Don't go to the bathroom yet I'll take you to catch the village cadres. If it's late, these grandchildren will run away!