Bad Dreams: Holly gets into bed with Paul and talks in her sleep about, apparently, losing her beloved brother in the snow. The trope is slightly averted in that she'd already revealed, earlier in that scene, that she worries about her brother, but not the extent to which it distresses her.
The Capital Of Brazil Is Buenos Aires: Almost averted, but not quite. Holly does learn Portuguese in order to go to Brazil, but she nevertheless pronounces her Brazilian fiancÚ's name, JosÚ, as if he were Hispanic. The pronunciation should be Zhoo-zeh, not Ho-say.
Worse, JosÚ even mispronounces his own name in this manner. The actor playing him (JosÚ Luis de Vilallonga) is Spanish.
Hooker with a Heart of Gold: Holly, though this is strongly toned down compared to the novella. She still refers to her "playing the field" though.
Kick the Dog: When Holly abandons her cat in an alley, it's the ultimate sign that she's selling out for a soulless life of luxury. And going back to find him is her redemption.
Little Black Dress: Holly Golightly's dress is probably the most iconic example of the trope in film history. It was designed, like all of Audrey Hepburn's costumes for the film, by Hubert de Givenchy.
May-December Romance: Holly's husband was much, much older than her, and had several kids before marrying her. Holly was still a teenager when they got married, and it sounds like their marriage was relatively innocent, with her doing nothing but sitting around at home all day.
Meaningful Name: What better surname than "Golightly" could there be for a free-spirited ditz with an unserious approach to life?
Most Writers Are Writers: Paul is a writer who has not had anything published in five years since writing a book of vignettes titled Nine Lives.
Not Even Bothering with the Accent: Justified. The film presents Holly as an Oklahoma country girl who was trained to speak with a British accent, though Hepburn can occasionally be heard slipping out of the British accent.
Qipao: The two Chinese girls who show up at the party both wear qipaos.
Smoking Is Glamorous: Ironically, Holly's cigarette stick was supposed to be an affectation that Holly assumes to cover her insecurity. It backfired. Audiences didn't get it, probably at least in part because of the choice of Audrey Hepburn for the role.
Spy Speak: Sally's "weather reports" which Holly passes forward.
Supporting Protagonist: While Holly Golightly is definitely the main character, her love interest Paul Varjak is the protagonist.
Yellowface: Mickey Rooney's role as the buck-toothed stereotype-Japanese Mr. Yunioshi is a notorious example. Recent DVD and Blu-ray releases of the film have people involved with its making apologizing for this, as well as a featurette titled "Mr. Yunioshi: An Asian Perspective" discussing the depiction of Asians in Hollywood.
Wakeup Makeup: You try sleeping not only in full, perfect makeup with your hair done up, but also with a sleeping mask on.