On the first level, in suburbs, when you are at the "crypts" location (or what is it), people can see interior of the second big room.
+ Strange, no sounds for doors at the first level and the last door opens TOO DAMN FAST!
It's all what i found for this time

I'll make an update tomorrow if I have time.

EDIT: The first bug you said is not fixable, is from the engine. All I can do is makign architecture to hide it but I'm not going to do that
I'll fix the other bug you said when I have time

In the last boss fight. I have been thrown out of the Arena where Mordekai is. So, after that, Mordekai's kinda stunned. And it's easy to kill him after that just by camping. Though it's good if you play it inside the Arena and keep an eye on bulls(Forgot their name). But it's great that we can go inside the Arena afterwards.