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After killing a monster if another monster is engaged soon afterwards the dread archer will usually stand with his bow out but not shoot. In the combat log you can see the sub pets successfully shoot their bows but the dread archer does not attack until the mob runs into melee ranged. Waiting a few ...

The Bonepatcher sub pet will not move within range to heal the Dread Commander if the group is in combat. He will remain stationary until combat ends no matter how far the Bonedancer moves away.

In Vendo Cavern dungeon there are a few Goblin Guards that spawn / agro in the floor / walls. We had them follow us through most of the dungeon from Gralf's room and Ursin's room. They would occasionally show up in a hallway and we could kill them but when they respawned they would agro in the floor...