 In the scene where Harpo Marx (qv), Chico Marx (qv) and  Allan Jones (I) (qv) are impersonating the three aviators in front  of the mayor, Groucho turns around to speak to them in a "foreign  language." What is actually being said is a direct response to the  accusations of imposters, only the audio track is played backwards.  The first time Groucho actually says, "Did you hear what he said? He  said you were frauds and imposters!" which is then followed by Chico  and Riccardo protesting loudly, "How can he say a thing like that?",  "This is ridiculous," and other such comments.