Question - you mentioned that series playlist show up more prominently but I haven't figured out where to find them on mobile (I'm on Android).
I'm wondering just how much difference it makes (in terms of increasing views or watch time) if the video appears in a series versus multiple playlists.
Also, is there a way to find out how many playlists a specific video belongs to?
I've only seen series playlist features appear on the desktop version of YouTube and not on mobile devices. On the desktop you'll see a playlist link above the suggested videos on the right hand side no matter how you find the video. This can help people discover the playlist, but I haven't seen it make much of a difference vs. a standard playlist.
I love the idea of being able to see how many videos a playlist belongs to, but that data isn't readily available in YouTube analytics.