It depends on how the season pass was saved. Some record a specific show on a specific channel. For example the new season of TOH started tonight. My season pass would have missed it. Since corrected.

Beyond that kind of thing, The season passes are only as good as the guide data, which is generated by a third party. Shows that are listed with a generic description, may be treated has being currently or previously recorded, and so be skipped 4 weeks out of 5.

Even recording all episodes can sometimes be dangerous. I have an SG-1 wishlist that catches every episode on every channel. Mondays string of 5 reruns generally will overwrite last Friday's new episode.

The point of this is not to run down tivo but to recognize there are many ways create season passes, and they can be hammers or finely tuned.