Films have a way of exaggerating what cannot be seen to some visual effect to entertain the viewer. To what extent can someone tell when you have used magic in that way? How much do you notice when you do that? If it's something you could catch looking back, then a video camera is a much cheaper if less awe-some form of a pensieve. But it doesn't take memory from anyone. How tight a focus is on the cauldron depends on the rest. Your court system has some major flaws. Ours does as well, and none is perfect. But it's shocking to see something missing key safeguards that protect rights. Does Wolfsbane work on other kinds of werewolves? I saw one of your kind here, but mostly they're a motley crew.
Muggles must have little that hold against magical wards. It'd have to be technology, something magic doesn't even consider to do anything at all. And as I'm as recognizable as another wizard, that's a no go to sneaking or early entry. Sneaking can be such a bad habit for a person.
I'll make my own notes when I ask you. Even dictating to a quill, there's better uses of your time than reciting your library, page by page. How unorthodox can you get about retrieving books? And how is it cumbersome? Those two together sound like you're filching the Library of Congress.
I know what we use for chemistry and why. I'll cross-reference their magical properties with the mundane. My grandmother would be appalled at getting entangled with magic doers, but she always stressed you cannot cook a good meal in a bad pot. I eat takeout myself.