First of all,
I joined a game to spectate and realised that the BS has had a Rapier on him..
However in his stats it did not show a plus damage (+whatever)
One commentator told me that it only shows the added damage etc after the point of your joining the game to spectate. I think it is an important BUG. It should show the real value.

Secondly,
This game was a friend's game and I right clicked him on friends list and joined his game to spectate.
It DID NOT SHOW me on the top right corner, HOW MANY spectators there were.
So if you join from friends menu (not from Watch tab) you CANT SEE how many specs there are in game..

Thank you for considering those 2 bugs. I have reported many things but havent seen them change. Maybe it was christmas and Valve was on vacation for so long.