Voice Actress Marla Frumkin filled in for Patricia Stevens for the voice of Velma Dinkley when Stevens could not continue for health reasons. Frumkin played Velma from "The Ghoul the Bat and the Ugly" to "The Ransom of Scooby Chief." Marla Frumkin Velma only has one line in "The Ransom of Scooby Chief" - "Have a good visit."
Let me at 'em!
The original syndicated end credits (as seen also on early home media releases) was the traditional Hanna-Barbera late 70s style of a black and white drawing featuring Scooby and Scrappy - identical in style to those seen on Godzilla (1978) and Casper and the Angels (1979). Subsequent re-runs and home media releases oddly use Hanna Barbera's generic 'explosion background', which was originally used for one hour repeats featuring episodes from The Scooby-Doo/Dynomutt Hour (1976) and not specific to this show.