I'm shocked that Acta would have the balls to make a "the way the grass was cut" excuse regarding Hernandez' error, which was pretty clearly of the "he nonchallanted it" variety.
As Knight pointed out, the team almost never takes infield practice, which by its very nature would tend to reveal such ballpark specific effects, should they exist (which I'm not buying as a cause anyway).
Who would be responsible for conducting infield practice? Manny, of course.