I got several correct results for "the 100 s02e16 eztv", but I also got some results with "s02e15" in the title too. This is the search site returning those results. If you're searching for a weekly show, use the weekly option in Add Rover window. Using the weekly Rover option will make it smart enough to filter other season/episode code. If you just use the quick search, it'll just show whatever the search site returns, which may or may not be as good.
I will try to make TorrentRover smarter even in quick search mode. In the future, if it detects a season/episode code, I'll remove results that don't match that code.