Terrible German dub

German dubbing is usually of very good quality and I really mean very good quality. German and english share many similar words, so it's even possible to go almost lip-sync when dubbing and english movie which is the majority of foreign movies. So dubbing is the norm here (although you can always find original language plus german subs on any DVD) and highly sophisticated - for example can you imagine that each major actor has his "own" german dub voice? That's because dubbing is an industry here, not a job for some students, there are so many professional voice actors here that it's easy to find very good matches of the original voice and once you found that, you stick to that person.

Anyway, the dubbing wasn't bad, the harakiri/seppuku mishap was one of the very few obvious mistakes. Some pronounciations might have been off, then again the way they pronounced "Shogun" was exactly how regular people would pronounce it. If they pronounced every name in perfect japanese, it would only confuse the german audience.
I am sure the OP just wanted to brag with his knowledge about japanese language and culture, that's all.