After the first season (from "The Scarab lives" to "The Ransom of Scooby Chief") of this show, the shorts were made with only Shaggy, Scooby, and Scrappy doo. The absence of the characters Fred, Velma and Daphne was due to some of the voice actors involved in the Strike and Emmy Awards boycott of 1980. After "The Ransom of Scooby Chief", Don Messick "had" to replace Lennie Weinrib as the voice actor for Scrappy Doo.
Let me at 'em!
On the Worldvision Home Video releases in the early 80s, the title cards on every Season 1 episode were inexplicably silent, though you could sometimes hear the echo of the last note as the episode began.