The thread has been updated.

Questline Bug:

For the Republic part II: If you talk to the Omerta Receptionist before speaking with the woman at the NCR embassy the quest become impossible to complete

Perk Bug:

Quick Draw causes pistols to holster incorrectly, making it take twice as long to draw them again. Essentially this renders the perk useless for pistols

Camp Guardian Cave exit (swim in the submerged cave). On the outside in Mojave whilst in the water swim to your left, there is a large low detailed 2D texture on the left that is half in the land, and half in the water.

Heres a top down view

...__________boundary net
L|
A|
N|----------- texture
D|
_/
c..e
a..x
v..i
e..t
\_


Also, Lake Mead Cave - There is a small crevice that you can swim into without much difficulty but get stuck when trying to exit it, because of invisible (on the major cavern side) stalactites that block you when you try and move out. It is located in the bottom right of the instance next to the two (close together) holes in the wall that light come out from.