Some more SE number quotes, from the Sci-Fi channel's 'The Force Returns' SWSE program (TWC298):
Phillip Feiner (Optical Supervisor) said: "Taking a look at the number of shots, optical, dupes and effects of over 800, it's a massive undertaking."
Also:
Rich McCallum said: "The color fading had dropped by 20-25 percent."
and:
narrator: "To update the film, Lucas added over one hundred nine new digitally created scenes."