This seems to be a pretty logical explanation of the strike zone, with a ton of credit to Castro: http://www.fangraphs.com/blogs/how-the-astros-wound-up-with-a-bigger-zone/
Another thing that is being ignored by those prone to try and do a post mortem for the Yankee failure is that of their own doing. What I mean by that is for years now we've been treated to the "Yankee way" of hitting approach. By that I mean, the Yankee-way is to make the pitcher work by being very patient at the plate and spitting on close pitches. Supposedly this is taught in the minors in their organization and every Yankee is supposed to make the pitcher earn their strike calls on borderline pitches. In this night, with this umpire, this pitcher, and this catcher (all key components) the "Yankee-way" wasn't necessarily the best approach to hitting. Keichel paints corners and is known as a low ball pitcher who has command of the strikezone. Castro "presents" the ball well. The umpire, Eric Cooper, is known as a low ball umpire. All ingredients that should have been taken into account by the Yankees to have a plan of attack against their playoff opponent. In the critical AB by Alex Rodriquez in the sixth inning, when Keichel seemed to be running out of gas, you saw the approach A-Rod took to the plate... swing at the first strike/fastball you get. Luckily, the four seamer was just high enough to create the lazy fly ball to centerfield. What A-Rod did in that AB that he didn't do in previous ABs was to eschew the Yankee-way of taking so many pitches and going up their looking for pitch to hit no matter the count. The count is alluded to in this article and is the point that helps when you factor in the key ingredients mentioned previously.
IOW - if you are going to keep the bat on your shoulders, don't blame the umpire for calling strikes on you that are corner pitches. You are taught early on in baseball, never leave the calls to the umpire to make... you'll be disappointed every time. You have a bat in your hands, you better damn well use it. That particular approach of looking for the first good pitch to hit happened to work well for the Astros to get just enough offense to win.
Go figure.