I figured I would list them out with details instead of making a post for each.

1. Audio glitches
A. Constant firing sounds - Noise of gun (sometimes not even the one you have equipped) can be heard constantly even when not pulling the trigger
B. Glitchy Firing sounds - Noise of gun chopping in and out, static type sound when sound attempts to come back
C. Total silence - Suddenly the game will lose all audio, weapons, ambient noises, everything. It will stay this way even after a Log out and log in attempt.
All of these listed happened during the Closed beta and the Open beta right up until the last day of both.

2. Visual Glitches
A. When moving into a new area Enemies will not load visually on the map. They will still be able to fire on you and you may be able to see tracers from their incoming fire,
but you cannot do anything to hurt them even if you determine where the fire is coming from.
B. While accessing certain areas of the map, I could see through walls to other sections of the map.
C. While attempting to clear the first mission, the piece of destructible terrain near the end of the level will disappear when shot but will not allow passage through it.
All of these were experienced during the Open beta on the first day for C and every day for A and B.

I have to say that I'm quite disappointed that these types of glitches were still so prevalent during the Open Beta, especially on the last day. I'm now quite hesitant to buy this game at launch as I'm concerned that these glitches will still not be fixed.