DVD 
In this section, as with Games etc, all that is required is the mention that they exist and there was an appearance. That is appropriate for an encyclopedia entry. A mini-synopisis of a film, game etc can get very fannish quickly and in most cases usually is. These efforts also often contain POV as the editor focuses on what they feel is important.

If someone were to delete an entire appearance, I would have issue with it, as they need to be cited and categorised. Hope that helps.