In the scene where the class goes on a field trip to a greenhouse, Edward is talking to Bella. He starts to say, "I'm sorry for..." then starts his sentence over again "I'm sorry for being rude...". If you listen, the first time he says it, it's with a British accent, and the second time it sounds normal. Because the actor who play Edward is actually from England, he must of accendentally slipped into his normal accent!