I never really thought about the fact that it was raining on or Coruscant or on Anakin for that matter, I just assumed it was there for mood...The thing I don't understand is how Anakin has an Oxygen mask on while being carried to the Medical building, but once inside for some reason he no longer needs it, limbs are re-attached, his clothing is picked off his charred body and a body suit is placed on him all the while never needing a breath mask?

So lets assume, maybe Vader can still breathe, just not well with his fried lungs, but fast foreward to ROTJ...."Luke, help me take this mask off.....but you'll die".

The whole breathing thing is a pretty significant part of the Vader persona, it would have been nice to accurately portray the person going into the suit as not being able to breath on his own without his mask dontcha think?.

That little lack of detail to Vaders condition in ROTS seems like a pretty big contradiction.