I've noticed that within the embedded live streams sometimes an option is given to follow those, which will then become added to the user's following list. However, in order to stop following these, it is required to hit the button again, similar like on the games (see image below).
Now on the older links, for example the E3 2015 Press Conferences, this special follow button on the stream is not existent, unable to stop following these older videos, as the "Notify Me" apparently only shows during the time they're airing within the embedded live streams as shown above. In addition, this button seems to appear also only during the time when the stream is off air, it won't show up while the stream is live.
Some could say now, "who would care less about this?". Well, the problem is that the user's following list will stack up resulting in objects following which cannot be 'unfollowed' any more:
I don't think that this was intended, or perhaps I missed a function somewhere, being able to stop following objects (including videos) the user doesn't want to follow any more?
In The Following List there is no option given to stop following them. For games it is required to open the corresponding game-site of Gamespot to hit the blue following Button there. But for videos this button is not existent.