That's the same thing I was thinking, Ric. Of all the times I've heard of when an actor breaks character and calls another character by his/her real name, it's when the relationship between the two actors causes that break of concentration. She'd have to really be out of the moment to get Hayden and Anakin confused when he wasn't even there! Besides, the filming of the scene wasn't as hazy as it appears on the screen. Someone would have noticed and made them retake. The only time people get away with that is during a noisy crowd scene when the director can't notice.