1. The ladder that's placed near the T side entrance currently is missing its texture.
Possibly just used the 'fast' render method in hammer.

2. The box at CT side mid, on the platform, is leaning off the edge ever so slightly to cause a lightly issue, Perhaps just move it a couple of units over?

3. Where the three boxes are at the left of mid (from T perspective). The two taller boxes are not close enough together meaning you can wall bang inbetween them.
Either move them together or add a block brush and use the 'tools\black' texture.
Unless this was purposely

4. At A site. the chainlink fence textures blocks are inconsistent in wallbanging terms, The one in the window is completely 'shoot-throughable' for lack of a better phrase. Whereas the short wall next to it can actually shot. (Use sv_showimpacts 1 to understand what I mean)
Also, the chainlink fence texure is placed in the middle of the window giving the impression that you could jump into that small ledge.

5. There is a box against a wall at the CT A entrance, It is ever so slightly off against the wall causing a very tiny two way pixel spot.