Bad calls plagued the Angels this series. In game 4, there was clearly catcher interference by A.J Pierszynski during Finley's at bat. There was a man on third and first with one out when the occurred. Finley grounded into a double play, clearly a blown call in a great situation for LAA.
Another blown call was when Podsednik was clearly picked off, but called safe. The extra out led to a run for the White Sox.
Those situations and another about Konerko's checked swing are discussed in
THIS article.
It is not the White Sox fault, they played good baseball regardless. However, the Angels did not get a fair shake, time and time again.