Trivia: Two of the acts that audition for Porky are a man whose trained pigeons fly out of a window, and a fox who does a dangerous stunt involving drinking chemicals. These acts would be re-used in a 1957 Friz Freleng cartoon, "Show Biz Bugs", with Daffy Duck as the performer.
Continuity mistake: When the dog with the flea circus comes in for his audition, he hands Porky his card and you can see that Porky is holding the card with his right hand, but when the camera closes up on the card in the next shot, Porky is now holding the card with his left hand.