By definition, he screwed up the speech. Excerpts from him explaining himself:
This guy should have known that the way he gave the speech would draw more attention to himself than to his attempted larger point, or his students.
But the father of four says all of the attention has been "upsetting to me for a couple of reasons."
"One is that I've become the story," McCullough said. "And it was their graduation. We were there to celebrate their achievement, their beginning. And now the cameras are on me and they really shouldn't be."
The other reason, he said, is that his message has been distorted with all of the focus on the "you're not special" part of his speech.
Read more: Teacher defends
As to the second point, the focus on "you're not special" - the guy spent at least four paragraphs of his speech needlessly hammering the "you're not special theme" before he got to what he felt was his central thesis.
He probably should have asked his dad, who is a 2-time Pulitzer Prize winner, and National Book Award winner, for a review of his speech draft before he finalized it.