The reason Harpo Marx's hair looks a little strange is that for some reason, the producers decided to curl and dye his real hair, as opposed to using his customary blonde wig.
Rick never says, "Play it again Sam," in Casablanca (1942) and, contrary to a popular rumor, the line does not appear in this film, either. The quote was often ascribed to the dialogue from the Humphrey Bogart film.
In Heinrich Stubel's bedroom, not too far from the end of the film, a lounge chair is visible by the closet, yet the next shot of the closet - the chair is nowhere to be seen.
Ronald Kornblow: Well, gentlemen, I'm a different man behind a desk - as any stenographer can tell you. But, uh, what I want to know, is why they're burying the last manager. And don't tell me it's because he's dead.