A list of bugs that I have encountered playing WvW since HoT:
General
All loot bags for all players are visible to everyone (the small bags on the floor when you kill an enemy player/NPC)
EotM waypoints have no text when linked or on mouse over
Some structures in Eternal Battlegrounds appear to randomly contest all the time for no reason – Lowlands keep and Jerrifiers Tower are two examples (archers on the wall appear to be attempting to attack the marsh drakes nearby)
some parts of buildings (mainly bridges) in EB do not replace the wooden model – thus resulting in 2 models constantly clipping though each other
strange oil placement on SM upper floor above the gates which cannon reach the ground below
Desert Borderlands
Siege cannot be placed outside the west outer gate of Air Keep (Preventing rams from being built in front of the gate
[needs confirming] possible random out of place guards in desert borderlands maps
NPCs, pets, minions, etc are damaged by the lava in the Fire Keep when standing on walkways over the lava where the player is unaffected
EotM supply delivery depot in home citadel is red in all borderlands
There are two holes in the terrain just south east of the Air Keep Poi
Have never seen a yak spawn at the south-east BL keep and move to Air Keep
Barricades appear on the map next to the Air and Fire keeps but are not present in the world