Many of my shows on TiVo and Media Center are off by a minute or more. I routinely lose the last minute or two of programming. I can't remember the last time I saw the previews for next week show. It may just be my local affiliates dropping the ball though USA is also bad about it since shows after WWE start late when WWE is live. On an episode of Tosh.0 he even made a joke about it where he was coming up with a new closing line but it didn't matter since TiVo cuts it off anyway.