mark7 wrote: the opening text for the episodes 5 and 6 it says "Episode V" and "Episode VI". This shouldn't be the case if they were original, right?

ESB & RotJ always had Episode titles. Star Wars got it's Episode title added in when the film was re-released, in anticipation of ESB coming out.

This is an example of one of those caveats about what is the Original Version of Star Wars. Some people do not want to see the Episode title, others just don't want to see the 1997 Special Edition changes, like Jabba.

As you mentioned the GOUT looking pale, this is another one of the things which the fans have attempted to revise. There are multiple projects in the preservation section of this forum where people have gone in and color adjusted the films. As my first viewing of SW was on a black and white Library Super8, i'm not a good person to ask what the films colors should look like.