More information: https://www.dvdcompare.net/comparisons/film.php?fid=28217#1

• Disk 1: Part 1 (170:50)
• Disk 2: Part 2 (180:44)
• Disk 3: Part 3 (197:24)

All of the BD extra's are under the "Specials" category:

"The Making of Shōgun" 2003 documentary (Play All - 79:51):

• "A Novel of Adventure" (5:02)
• "The Cast" (17:51)
• "Nagashima" (3:11)
• "Toho Studios" (5:34)
• "Cultures Collide" (10:15)
• "The Art of Shōgun" (3:18)
• "The Erasmus and the Gallery" (8:15)
• "Controversy" (4:14)
• "The Earthquake" (5:32)
• "Escape from Osaka Castle" (2:14)
• "The Blockade" (4:11)
• "Post Production" (4:11)
• "Shōgun Makes History" (6:03)

Historical Perspective Featurettes:

• "The Samurai" (5:37)
• "The Tea Ceremony" (4:37)
• "The Geisha" (4:58)

Selected Scenes Audio Commentary by director Jerry London:

• "Blackthorne's Arrival at the Castle" (1:34)
• "Blackthorne at Ochiba's Party" (1:06)
• "The Crazy Dance" (1:23)
• "Lord Buntaro Shoots Arrows" (3:22)
• "Blasting of the Fishing Boats" (2:19)
• "The Arrival of Toranaga" (1:16)
• "Blackthorne Rebuilds His Ship" (1:14)

But they do not include Part 1, 2 or 3.

EDIT: Would it be more appropriate/desirable to edit the "Specials" to include Parts 1, 2, and 3 from the BD release?

We only support the original TV broadcast.

An episode group can't be used in this case as it can only be use to reorder existing episode.