Episode I Webisodes & Featurettes
https://www.youtube.com/playlist?list=PLA5E2EE8E10B45724 - Full playlist from the mranderson00001 YouTube channel.
“A 12-part web documentary, which originally appeared on the official website. A wide variety of topics were covered, from Lucas’ very first day of writing the new script through production design, costumes, creatures, the casting of Anakin, problems with R2-D2 and other issues.”
Episode II Webisodes & Featurettes
https://www.youtube.com/playlist?list=PLDC9DF0527A71C0C1 - Full playlist from the mranderson00001 YouTube channel.
“A 12-part web documentary, which originally appeared on the official website. Covering a wide variety of topics from the pioneering use of digital photography to locations, to various technical challenges, etc.”
Episode III Webisodes & Featurettes
https://www.youtube.com/playlist?list=PL0918EFDB5FB29B49 - Full playlist from the mranderson00001 YouTube channel.
“A 15-part web documentary, which originally appeared on the official website. It covers running the production simultaneously from California and Australia in the early days, linking Revenge of the Sith to Star Wars, “old-fashioned” special effects, creating General Grievous, weapon design and construction, pick-ups and re-shoots, McGregor’s take on Obi-Wan, McDiarmid’s performance, etc.”
A few select webisodes (that I personally think stand out or are particularly fascinating):
Thousands Of Things (Doug Chiang designs the Naboo Starfighter)
Bad Droid Karma (building R2-D2 for ep. I)
A Twinkle Beyond Pluto (about the Ep. II extras)
A Jigsaw Puzzle (about the Ep. II miniatures)
Creating General Grievous (from brainstorming to concept art)
Becoming Obi-Wan (McGregor talks about his performance and emulating Alec Guiness)
The Creatures of Episode III (about make-up effects and animatronics)