I saw this documentary in a Spanish channel, antena 3, in the 90s. The documentary was about the history of Hanna Barbera, with fragments of shorts and series. The documentary have some parts filmed in live action, in which the person who was talking appeared, but now I’m not entirely sure that this person is the same throughout the documentary. I think the documentary was in the early 90s because they shown a scene of “Jetsons: The Movie”. Perhaps the documentary was made shortly after the premiere of the film or perhaps was to be released in cinemas in a few months.
I remember that in a fragment of this documentary a fragment of an episode of “Blast-Off Buzzard” and a “Its the wolf!” was shown. Later in the documentary they spoke of the superhero series that made Hanna Barbera and the animated Godzilla was shown for a few seconds.
Near the end the person who was speaking was in a warehouse, with shelves full of celluloid tape, containing episodes of Hanna Barbera series.
At the end of the documentary, when the presenter said his last words and was leaving the public, behind him appeared a kind of carnival float or animatronic shaped green monster with horns and glowing eyes. It was coming up to him and swallowed him.
Could it be “A Yabba Dabba Doo Celebration: 50 Years of Hanna Barbera”? In the end of this documentary the green monster appears?