One of the things I really enjoy about the full mini-series version is that you see Herr Kaleun interact a lot more with some of the crew, and in different parts of the ship's interior. In the theatrical cuts I don't think he's seen anywhere other than the O-Messe, control room, and his own quarters except for once at the end when he's checking in on vital engine room repairs. In the extended cut, though, the level of involvement, concern, and oversight on his part throughout the patrol is far more explicit.

Plus he's just onscreen more which you will never hear me complain about ever. :D