Corrected entry: When Jacob is first introduced to August, he says there is a vacancy for somebody to carry water for the elephants. At this time in the film the Benzini Bros. circus didn't own any elephants, until they bought Rosie later on.
Corrected entry: The invitation from August to Jacob uses the name Rosenbluth instead of Rosenblum.
Correction: This point is addressed in the movie, immediately after it is made, by one of the other characters. It turns out August was being sarcastic at the moment.