If you want to turn it off, you can go to puzzles and click the settings button. As for the incorrect ones, apparently if the top engine move is played, the thing in the hint happens, even if it doesn't happen in the puzzle.
Coach puzzle giving advice
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Quite recently in puzzles the coach started giving some introductory advice, like "You are in a critical position. Calculate correctly and you can win my rook".
What are your thoughts about this? In my opinion this gives unnecessary help. In puzzles you are in an advantageous position, where you know that there is something there. In a real game you do not. At least the puzzles should leave it for the player to find what is the key in each problem.
I do not think that this ruins anything, just simply saying that this is not an improvement and I am curious to read other people's thoughts about this. The only time where I find it downright bad is when the given introduction is false, as I had a puzzle where the coach hinted that there was a pawn to be won when it was actually a bishop.