Red Herring’s aunt from “Night of the Boogy Biker” is voiced by Scott Menville.
Dawson Casting: It's averted with the actors playing Fred, Daphne, and Velma, all of whom are voiced by actual children. It is however played straight with Shaggy and Scooby, with Casey Kasem (who was in his late 50s) and Don Messick (who was in his early 60s) playing the young versions of their regular characters.
Carl Stevens replaced Frank Welker as Fred, making this the only Scooby project where he didn't voice him.
Kellie Martin replaces Stephaniana Christopherson and Heather North as Daphne.
Christina Lang replaces Nicole Jaffe, Pat Stevens, and Marla Frumkin as Velma.
Role Reprisal: Casey Kasem and Don Messick return to voicing Shaggy and Scooby. They're even given top billing.
Talking to Himself: Frank Welker voicing Eddie Jones and Casmer Codwaller in “Chickenstein Lives!” and in “The Computer Walks Among Us”, he voices Dinkley 2000, Bruce Wormsley and Mr. Dinkley.
Don Messick voicing not only Scooby, and recurring characters Jenkins (Daphne’s butler) and the newscasters but also Daddy Doo in “Curse of the Collar” and “The Were-Doo of Doo Manor” as well as Horton-Doo in the latter episode.
Casey Kasem not only voiced Shaggy but also his father, Mr. Rogers.
Charlie Adler voicing Wender McWender and a nameless little boy in “The Schnook Who Took My Comic Book” as well as Gus and Crusty Baker in “Horror of the Haunted Hairpiece” and Mr. O’Greasy and Grady Laurence in “Lights . . . Camera . . . Monster”.
James Avery voiced Count Shockula and Skippy Johnson from “''Night of the Living Burger”.
Scott Menville voicing neighborhood bully Red Herring as well as his aunt, Hedda.
BJ Ward as Mrs. Rogers, Sugie and the babysitter from “The Babysitter from Beyond” along with Bona Lickton, Bernice Binder and Mrs. Shusham in “The Ghost of Mrs. Shusham” and Mrs. Dinkley and Mrs. Stickler in “The Computer Walks Among Us”.
Michael Bell as Mr. Ryan and Jay Littlefield in “The Story Stick”, and Mr. Peterson and Mr. Forester in “Snow Place Like Home".
Jim Cummings as Ghost of the Hooded Heifer/Hooded Heifer, Coolsville Comet and Herbert Blaum in “Wrestling Maniacs".
Technology Marches On: Despite the show supposedly taking place in the early 60s, when the gang was younger prior to the original Scooby-Doo, Where Are You? premiering in 1969, some late 80s/early 90s technology was present. Velma often would type data in a large computer that would pop out of a briefcase, and Daphne could be seen with a cell phone (which was quite rare to see back then, but much more common today.)
Word of God: Scooby's two brothers names' had been a passed around joke studio wise (Scooby Doo has a brother named Howdy Doo?), but turned into actual characters for a cameo.