First, occasionally I'll get an "invalid target" error when I shoot Black Arrow at a target. This appears to happen most often in instances, as opposed to while questing, but isn't happening consistently enough to figure out what may be causing it.

Second the pet "fetch" glyph is a great idea but the result is inconsistent. Sometimes my pet picks up the loot, sometimes it doesn't. I've noticed that it's more consistent if my toon is standing still while the pet is looting, but even that's not always a guarantee it will work.