This is not really Special Content, but The Rocketeer was released in pal Region 2 in 5.1 english sound and anamorphic while the us release is a laserdisc dump in 2.0 and letterbox.

The Evangelion Films for those who like anime were also released in Japan region 2 in anamorphic and with dts sound. Too bad no english subtitles or dub tracks.

The HD remasters to dvd of Space Battleship Yamato season 1, Cowboy Bebop, Outlaw Star, and Ghost in the shell, Lupin III movies and tv, are all japan exclusives for anime. The Ghibli Film My Neighbor Totoro has the original fox dub in japan and not the bad disney one. Also the film Princess Mononoke is a 3 disc edition and we got only a single disc. The second Urusei Yatsura movie was released in anamorphic and remastered in japan but no us release.

Japan had a 2 disc edition for Underworld Evolution, Aeon Flux, and X-men the last stand. The last stand was available in just about all regions except the us which got barebones single disc.

The Flash Gordon 1980 pal DVD not sure if its the UK edition or french one has an audio commentary with brian blessed and the director.