Somethings unclear too me:
Did Erik know Schmit/Shaw was a mutant?
When Charles says to him: "You think all humans are like Shaw."
I was under the impression he didn't because he never seemed surprised to discover after all these years he was.
I'm also surprised that after Shaw killed Erik's mother, that he didn't send all those those objects in the room crashing though the glass to crush Shaw. That's some control for a kid that wasn't supposed to have it yet.