Got a cool idea for a game: I'm going to post a score by a celebrated composer with (what I feel is) an error that that composer made in the music, and whoever finds it first posts another one and so on. No nonsense pedantry please! Errors identified by ear (rather than sight) a necessity in choosing scores!
First:
Rameau - La Joyeuse
I played through this piece and the error jumped out at me and made me wrinkle my nose, so I don't think it's one of those exceptional cases!