It turned out that what happened was different from what I had expected in my mind.
The resultant situation is something that happened later in time than when you made predictions about the same.
I don't really understand why in the first sentence past perfect is used and in the second past simple. For me both actions the expectations (first sentence) the predictions (second one) came first.
May be the explanation lies in the fact that the first one is past and the second one is present. What is confusing me is "happened" past simple: the predictions came before the happening. So if happened is past simple what came first should be past perfect. That is why I think had made might be better.
This is really confusing!!!!!