but that doesn't account for...
the fact that he could have been seeing footage of the second plane hitting a tower.
I've read the text. It says nothing about him seeing the footage prior to entering the classroom. Where did you get that? Didn't you watch him that day on the news? They showed him right there when he was told. It was right there for everyone to see. In fact that's been one of the criticsisms, that he reacted too calmly, as if he was supposed to run around screaming in front of a classroom filled with kids or something.
"he's either intentionally or unintentionally mixed up his recollections" -- Again, where does he claim that's the FIRST plane? I'm not seeing that.