First: Collectible audio phone in "safe area" off H St NW and 4th St NW in Judiciary Square cannot be collected. Icon shows up on map, phone shows up on chair, but no interaction possibilities from below, above or next to the item.
Second: DC Headquarters wall power panel at the beginning of the mission shortly after collecting Intel from the laptop can be glitched with seeker mines causing it to constantly spark as if broken, but cannot be interacted with. Logging out and back in resets the mission back to the start with no way to get into the first building with the laptop causing a total mission restart required.
I could not replicate the seeker mine bug no matter how I tried in situation #2. When it first happened I was still inside the building where you collect the laptop before going in the courtyard. The power box displayed as broken but was not interactive to be shot to release the locks for the doors to open. Hope this helps!