I guess you did set the stage
well you have already acknowledged the bad quality that definatly could have been done better you just need to clean up your art work it seems like from the style you have chossen for your movie you are not trying to make it look realistic but still in my opinion you have to put some effort into line work and animation
but aside from that the joke that was deliverd had an alright set up it had an introduction a body and a punch line and you have introduced your characters just work an your art work