The deformation in ROTS is the idea of the masks are dropped.

He was always like this. only the evil face was finaly out. Never thought that his face was like that from the lightning accident.. Think about it.

He was clearly looked evil and deformed so anakin had the picture of what he was gonna choose.

In ROTJ palps is an alter ego of yoda. A weak old lady..man! that can trick you with her...HIS! appearance before you ll find youself fried by the force :)

EDIT: BINGOWINGS BEATED ME

-Angel