Some CoS points

Catching up on my reading, I noticed some things from earlier chapters:

146: "While Filch wasn't guarding the scene of the crime, he was sulking red-eyed through the corridors, lunging out at unsuspecting students and trying to out them in detention for things like "breathing loudly" and "looking happy."" These punishments reminded me a bit of stories from nurses in occupied Belgium during WWI, when the Germans made it illegal to go about with anything but a cheerful countenance.

151: Professor Binns explained the legend of the Chamber of Secrets, but denied its existence. Was he lying, or did he not know? Mr. Malfoy knew the chamber had been opened by Riddle, but the rest of the wizarding world blamed Hagrid's monster for the death of Myrtle. However, we know from the conversation Harry overheard in the hospital wing when Colin was petrified (180-181) that Dumbledore, McGonagall, and Madame Pomfrey all knew the Chamber of Secrets existed and had been opened. Perhaps it makes sense that, if not all the Hogwarts teachers knew, they would. Dumbledore, also, knew right away that it was Riddle opening it: "The question is not who [but] how..."

What do you guys think?