Holly's couch is really an old-fashioned bathtub split in half. In some scenes, you can still see the gold handles at one end and the legs on the bottom.
Contrary to popular belief, the movie follows Truman Capote's original novel quite closely. The character of Mag Wildwood, the Amazon-like model who crashes Holly's party in the film, is a major character in the novel. Capote describes her as having a stutter. In the film, Mag does indeed stutter though this isn't explained. During the shoplifting sequence, Holly briefly dons a Huckleberry Hound mask; a direct reference to a line in her song, "Moon River." Although Audrey Hepburn's performance of "Moon River" is unsurpassed, it would not be officially released until after her death. Holly's "bad date" prior to her first visit to Paul's apartment is only heard behind a door. The man who provides this voice is uncredited, but he sounds a lot like Mel Blanc,who at the time was working with film co-star Alan Reed on The Flintstones (1960).
About nine cats were used throughout the film as the role of Cat.
Cat is played by at least two cats, a yellow mackerel tabby and a yellow classic tabby, that change back and forth throughout the movie. (The Trivia section says there were at least nine cats.)
In the famous "it should take you exactly 4 seconds to cross from here to that door. I give you two" scene, it takes Paul exactly 4 seconds from when he starts walking to when he reaches the door.
The party sequence was reportedly the longest and hardest scene to shoot in the movie. Most of the gags that occur in the scene are not in the novel, but originally scripted by Blake Edwards.
Truman Capote was reportedly unhappy with the decision to cast Audrey Hepburn as he'd been in favor of Marilyn Monroe. Hepburn was very self-conscious of her performance while Capote was on set as she felt inadequate as the Holly he had envisioned.
The Patricia Neal character does not appear in Capote's novella. The subplot of George Peppard serving as Neal's "kept man" was apparently added to the movie to establish the heterosexual credentials of Peppard's character. This then allowed for the movie's boy-gets-girl climax, something also not found in the novella. It also gave Peppard a chance to appear bare-chested in a bedroom setting, the very best "beefcake" scene in his entire movie career.
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