Yup, James, it takes about 48 hours' notice of a schedule change for TiVo through Tribune (its listings supplier) to get a change into the listings. They've managed to get the listings corrected a couple of times when presidential speeches on Thursday have been announced on Tuesday.
Of course, there are some people who only plug their phone lines into the TiVo once or twice a week. For them, these kinds of schedule changes are really hit or miss.
I guess it's kind of natural to blame the TiVo/Replay for missing events, even though the blame is misplaced. We become so reliant on the machines to get our programming, and they do such a great job of it under normal circumstances. But they still haven't developed a way to handle last minute changes or sports overruns that push programming back.
There were even a couple of ying-yangs back in September who blamed TiVo for not recording programs that never aired because of the WTC attack.