Deus Ex Machinas in the Harry Potter series.

[hyrdatas]

Well, there might be, but if there is, it was never big enough to annoy me. Like nothing completely WTF inducing or anything. It usually makes sense in the end if you think it over, ya know.  

[Remus_Lupin3]

Well, maybe that's why she's keeping Harry alive. So that's why he and his friends all survive, because shes had the seventh book planned from the start (therory).