Nothing that immediately sticks out at me. My parents didn't like the local schools and deliberately spent quite a lot of money sending me to a private school where there was a really high quality of education, in fairness. The one thing I can remember is a substitute French teacher did teach us phrases that were very... unfrench, just translated directly and too awkward, would never be spoken, etc. If I've been taught something wrong in university, tbh it's probably gone over my head
I did have a horrific Information Systems lecturer this year though, when I asked a question he told me perhaps I'd become inspired by the computer, never did answer my question, and a complete sexist absolute cunt. One of the billions of qualifications my mother has is in this, and she had to re-teach myself and a group of friends. He really never taught us ANYTHING. Ugh, hateful cunt.
Oh, and a dopey English teacher told a girl to move because she was disrupting the Kama Sutra of the room. We think he meant feng shui, but you can never be entirely sure in a catholic all-girls school, I suppose.