Its not a mistake to make a good swing, with good timing, even if the result isn't positive. There is success and failure. Hurrying a throw while charging the ball and 2-hopping it on the money and in time also isn't a mistake. Mistakes do happen and will happen again. When a player is set up to repeat the same mistake again and again because he isn't good enough to prevent it-- then one has a problem.
When a catcher slaps his mitt at pitches it is a mistake every time. When he misses the ball, then its more noticeable. When he uses bad footwork or when he comes up with his body as a first movement instead of going downward, success just won't occur often.