The only time the mistakes even mattered were tonight.
Game 1: Cards offense pounded Verlander and Reyes pitched them to a win.
Game 2: Rogers pitched a gem, pine tar or not, and the Tigers little offense won them the game.
Game 3: Carpenter pitched a gem, and Edmonds double was the difference. Not the Zumaya error, it only added insurance, which wasn't needed because the Tigers plated zero runs, regardless.
Game 4: Cardinals fought back to 3-2 with clutch hitting from Eckstein, Rolen and Molina. Then, they caught a break with Granderson slipping on a wet field and Rodney threw a ball away. After that, it was timely hits by Wilson and Eckstein (Monroe was playing in and he got it hit over his head, this was not a defensive lapse).
This is not as fluked as you are going on about. Yes, the Tigers have been flat. But you can't blame it all on defense and the layoff. Give credit to the Cards pitching which has been stellar throughout the postseason.