I can think of one: cross-over episodes. Say I wanted to create a collection of paranormal TV shows, such as Sleepy Hollow. However, there was a cross-over episode where the characters appeared on Bones. One may wish to have that single episode present in the collection, but not every episode of Bones.
(Personally, I'd rather the ability to have movies and shows intermingled. This would allow for "universe" groupings that include both media types, such as the Marvel Cinematic Universe, or the Stargate franchise. Also playlists, to allow related shows to be interwoven in a "viewing order".)