How will the conflict between Derek and Addison resolve itself?
Why are Derek and Mark seen beating the crap out of each other?
Was Izzie Stevens misdiagnosed - and what is her actual condition?
Who is Faye Dunaway playing and what did her character do to stir things up?
It's all coming up tonight at Seattle Grace in "An Honest Mistake." Follow the link for find out more about these burning questions and lots more Grey's Anatomy spoilers!