Not sure if this has been brought up, but I noticed that if I kill two things at the same time, I only get exp and drops for one of them. I assume it's because the other one isn't 'engaged' as the name doesn't turn red, even though it's getting damaged and attacking me. Switching targets obviously isn't as straight forward as it should be (thanks SE) but I tried disengaging my primary target half way through the fight and switching to the other one to direct my spells towards that one. By the time I've switched and casted, the other one's name stops being red.
I'm not sure if this is intentional or not, but just thought I'd mentioned it. Anyone else have any experience with this? I haven't really tested it much.