In 3.198, I was marking all the movies I had watched as "Watched" in Media Companion. To make it easy on myself, I set the filter to show only Unwatched. This worked great with most of the movies in that when I clicked a movie to be watched, it disappeared from the list (as I'd expect). However movies that start with the word "The" are not filtered by the Watched filter.
Any movie that starts with "The " will not be filtered by Watched (and maybe Unwatched) filter.