Did Baseball juice up the balls for the World Series? It looks like it:

Once the baseballs were cut in half, Levine and his interested teammates noticed the inner materials were the same, but the World Series ball was wound tighter.
Angels shortstop David Eckstein said he thought the baseball not only was harder, but also smaller than the regular-season ball.
"My hands are small, so the first time a ball was hit to me in the game I could tell it was smaller,' he said. "And it was hard as a rock.' Long Beach paper

With a World Series record 11 homers hit in the first two games of the best-of-seven series, beleaguered pitchers are claiming the offensive explosion is the result of a harder and livelier ball being used in the playoffs.
The slugfest has also put a couple of other World Series records in jeopardy, total home runs for a series (17) and most home runs by one team (12).

Adding credence to Percival's theory, the light-hitting Angels have hammered a postseason record 21 homers, four coming from Adam Kennedy, the second baseman who had just seven round-trippers during the regular season. Monterey Herald