I Am Not Shazam: The protagonist's name is "Holly", not "Tiffany". "Tiffany's" is a jewelry store and the breakfast in question consists of consuming a pastry and coffee while browsing the shop window display.
Values Dissonance: Mickey Rooney in Yellowface rubs many modern viewers the wrong way.
Values Resonance: This particular line of Holly's from the original novella might be more true today:
I'd settle for [Greta] Garbo anyday. Why not? A person ought to be able to marry men or women or— listen, if you came to me and said you wanted to hitch up with a Man o' War, I'd respect your feeling. No, I'm serious. Love should be allowed. I'm all for it. Now that I know what it is.
WTH, Casting Agency?: Ms. Hepburn has stated that she was terribly miscast (Capote wanted Marilyn Monroe for the role). And yet she made it work. Mickey Rooney as a Japanese man, on the other hand...