When Felix (S.Z. Sakall) first meets Yardly (Sydney Greenstreet), he takes an immediate dislike to him and mumbles under his breath, "Fat man" and walks away. In The Maltese Falcon (1941) Greenstreet played the role of Kasper Gutman whose code name was "Fat Man".
Until 1949 US Navy enlisted rank (rating) was separated by occupational type; Seaman ratings and Artificer ratings. Seaman ratings were worn on the right sleeve and Articifer ratings were worn on the left. Our hero identifies himself as a Quartermaster which is a sea occupation thus properly wearing his rating on his right sleeve.
Peter Godfrey and Sydney Greenstreet were both veterans of the London theater scene and had developed a strong friendship by the time that this film was in production. The pair reportedly kept the rest of the cast in good spirits with plentiful jokes, stories, and spoofs.
S.Z. Sakall, who plays Uncle Felix, was of Hungarian ancestry (born in Budapest) and serves several Hungarian-inspired dishes in this film (he adds paprika to the stew, makes goulash, kidneys, etc.). This was an instance of art imitating life; Sakall detested "American food" and insisted on only eating Hungarian or continental food, even having his wife cook his lunches for him while he was on set.