Actor Allusion: In his first appearance, Jeremiah Surd laments that news coverage about his nerve gas interrupted Scooby-Doo. His voice actor, Frank Welker, has voiced Freddie since the very first episode in 1969.
Keep Circulating the Tapes: The show had a few single-episode VHS tapes and laserdisc releases during its run, but was all but forgotten after that, especially after the Time Warner merger. Most of the episodes can be found online, though, thanks to the shows' faithful fanbase. Finally in 2009, Turner released a DVD set of the first 13 episodes of season 1, including director/producer commentary and "making of" mini-features. The second half of the first season was released in 2012. The Second Season followed in November of 2015.
As of 2013, the full series is now available for download on iTunes and Google Play.
The Other Darrin: Due to the different seasons of the show originally being intended to be separate series, as well as the overhaul in production, the cast changed between seasons 1 and 2.
Race Bannon was first voiced by Robert Patrick, but then by Granville van Dusen (his '80s series voice actor) for the first two episodes of the second season. van Dusen was then replaced by Robert Foxworth.
Jessie was voiced by Jesse Douglas in season 1, but then by Jennifer Hale afterwards. Jonny went from being voiced by J.D. Roth to Quinton Flynn, while Hadji went from being voiced by Michael Benyaer to Rob Paulsen (who had previously voiced the character in the '80s telefilms).
Playing Against Type: In Season 2, John de Lancie voices the straight laced Dr. Quest—a role as far removed from Q as humanly possible.
Recycled Script: The season 2 ep "Eclipse" was cannibalized from an unfinished episode of SWAT Kats, "The Curse of Kataluna" (which would've had a Succubus). Not surprising, since Davis Doi, co-producer of season 2 was also a producer of SK; Glenn Leopold, who wrote the ep and a majority of SK eps, also recycled elements for Scooby-Doo on Zombie Island.