Continuity mistake: When Holly and Paul are at the library viewing Paul's book, Holly encourages Paul to autograph the library's copy of his book. Paul grabs a pen off the library's counter and begins to write in the book, then in the next shot Paul once again takes the pen from the library counter to write in his book.
Paul Varjak: Holly, I'm in love with you.
Holly Golightly: So what?
Paul Varjak: So what? So plenty! I love you. You belong to me.
Holly Golightly: No. People don't belong to people.
Paul Varjak: Of course they do.
Holly Golightly: I'm not going to let anyone put me in a cage.
Paul Varjak: I don't want to put you in a cage. I want to love you.
Holly Golightly: It's the same thing.
Paul Varjak: No it's not. Holly...
Holly Golightly: I'm not Holly. I'm not Lula Mae, either. I don't know who I am! I'm like cat here, a couple of no-name slobs. We belong to nobody and nobody belongs to us. We don't even belong to each other.