I just found this video and it actually contains a few interesting points I had never seen before. #1, #3 and #4 were new to me especially.
https://www.youtube.com/watch?v=_bswR9GzYWI
https://www.youtube.com/watch?v=_bswR9GzYWI
I had a nice pang of nostalgia watching that. Just hearing that BGM makes me want to fire it up again.
Few RPGs can match Gothic 2 when it comes to hidden areas and stuff to find.
None of the things he shows are very hard to find though. There are some cool Easter eggs that are far more difficult to discover.