The colours of the sabres in ESB are still all over the place. Vader's saber is orange, purple and pink, but never really red, as it should be.
I was relieved to see a lot of the saber mistakes corrected in ANH. Luke's lightsaber aboard the Milennium Falcon looks more white than anything, but that was always one of the crappiest saber effects in that film.
The sabres in ESB, however, disappointed me. I mean, goddammit - how hard can it be to colour-correct all of them?!