My understanding of the core of TVR is the regex identification of shows and movies. That is the black magic everything else is built around. Most of the time this does an excellent job. If it fails (and I notice), it's generally that it identifies the item as something with a name that is a partial of the name of the file in question.
Today's example: "Air force one down" is identified as "Air" (which I seemingly have), and if I hadn't noticed, it would have been deleted.