I have the box set. It is a blast. 😃
The movie itself is in two versions on separate discs:
Disc 1: English version with restored uncut scenes
Disc 5: German version with restored uncut scenes (German credits & reshot letter)
The format is 16:9, and most of the transfer is actually Universal’s. The uncut footage from a German 35mm copy has been graded to fit in.
English 5.1 & mono, German mono, Audio Commentary and the Isolated Score have all been adapted to accomodate new footage. The isolated score, has some sound effects on the extended scenes (apparently the German mono mix was the only source for those cues).