I've seen Attack of the Clones and Revenge of the Sith more times then I can count. Something that always bothers me in those films is the fact that when Anakin gets his arm cut off at the end of Clones, it is severed above his elbow; yet, in Sith his arm is shown as cut off below the elbow.

Did he somehow find a way to "grow back" part of his limb or was this just a goof on the part of Lucasfilm? I haven't been able to find any explaination as of yet, so I am left wondering.