Zhure said:
Other things that bother me: When did Anakin put on the growth spurt that made him the towering figure that is Darth Vader?
See!
Now we're getting to some interesting questions!
I really doubt that this is anything Lucas will ever concern himself with. Hayden is pretty tall, maybe some black platform boots will cut it.
But, there's an interesting treatment in the Star Wars Technical Commentaries at theforce.net of the extent of Vader's injuries. One of the stronger theories developed is that Vader is
literally, in Obi-Wan's words, 'more machine than man'. I saw a chilling piece of fan art there, based on the details posited, of Anakin in a bacta tank, being kept alive while his replacement parts are being built.
A head, two shoulders, much of an upper torso, and most of a left arm. And a bare spinal column trailing down into the shadows of the tank.

In the 'rebuild', the torso would probably have to be larger than Anakin's original in order to accomodate the life support machinery, and the limbs would then be lengthened to maintain proportionality.
How he could survive such terrible injuries (really, worse than Darth Maul's bisection at the end of TPM) long enough to be fitted with the Vader suit, well, that's just a mystery ...