Chandler (Louis Sorin) says to Spaulding (Groucho Marx), "Tell me, Captain Chandler -- excuse me -- Spaulding ..." Spaulding replies "Spaulding, that's right. I'm Spaulding, you're Chandler. Let's have no more of that. It's bad enough being Spaulding." Marx may have been improvising in response to a real flub by Sorin, or it may have been scripted dialogue showing that the former fish peddler, "Abie," is having trouble remembering his own alias, "Chandler."
The goof item below may give away important plot points.
In the final scene of the movie, just as Professor is about to drop all the cutlery from his sleeve, the camera cuts to a close up of Ravelli. For an instant his hat is pulled down very low, covering his eyes. However, just before and immediately after, his hat rests normally on his head.