Batman Beyond: Return of the Joker needs to be removed from this collection and added to the Batman (DC Universe Animated) Collection as it is a continuation Batman: The Animated Series like all the other films in that collection. This collection shouldn't exist as Batman Beyond: The Movie although called a movie, it is a compilation of the episodes "Rebirth, Part I" and "Rebirth, Part II", with "Golem", "Meltdown", "The Winning Edge" and "Dead Man's Hand" from the series called Batman Beyond.

Yes Return of the Joker is a continuation of both series but it fits better in the other collection as they all are related to Batman: TAS.