At the beginning when Anna shows up at the bookstore, the guy who stuffed the book in his trousers went up to ask for her autograph, but when he said "Autograph," his mouth was moving with the word not even coming out. I had to put my TV on close captioning to understand what he said!
I don't think this really matters much, I mean I could tell he was asking for her autograph, and she's famous. There's not much else he would ask her for. Also you have to remember that some people from England have VERY strong accents, and even though we speak the same language, it can be difficult to understand. I don't think this counts as a slip-up.