Your original question asked more than one question, and so according to enotes regulations I had to edit it down to focus on one aspect - the summary of the final scene of the play, Act II scene xi.
This scene bears the title "Backstage." As the curtain opens, we are presented with the Aborigine by himself outset and talks about the illness that he has. This is clearly shown to be smallpox that he has contracted from the unwanted visitors. Then, after this, the actors burst in with great excitement. Wisehammer says he has written a prologue for The Recruiting Officer, which include the phrase "our country's good," which ironically hints at the possibility that the transportation of the convicts had actually made England a better place. They still express loyalty to England as their country. Then the director and other actors decide that this prologue is too political and although it is well-written, it should not be used. As the play ends we are left with the cast waiting anxiously for their cues and listening with nervousness as one of the actors begins the play with the opening lines.