its not mistake, its lack of work. they're a difference between someone who try something and just missed his play and a guy who just totally stop playing for a second, 2,3,4,5 second...
Work is the basis to win in playoff on 200 feet of the ice 100% of the time. not working hard 100 feet ice 50% of the time.
watch every team who won the cup, you will see the same thing on every of those team no exception. They basically dont have any passenger on their team and everyone playing at 100% of what they can do. i dont talk about scoring, stats or whatever, just about work.
The day leafs will finally win it is the day they will stop playing with passenger...if this day happen one day and it was the same story with SJ couple of year ago... they can do all the move they want, until everone dont understand they cant take any shift off, leafs have no chance in playoff.