To go to town means to act with great energy and/or enthusiasm, and in this context Pa Kettle is going all out in the movie.
Consider the staetement "The last time Reuben had seen anyone do that was Pa Kettle in the old movie Ma and Pa Kettle really going all out.". Based on this statement, is "The last time reuben had seen anyone do that was pa kettle in the old movie ma and pa kettle go to town." a true statement? Yes/no/unknown