There were several villains which ended up not being used in the final cut of "The Spooky Fog." These model character design sheets by Alex Toth show two unused villains, "The Phantom Figure" and the "Bearded Ol' Ghost." The pictures also reveal the previously unknown official names for some of these ghosts, "3-Eyed Spook," "Giant" and the "Skeleton Stage Driver." You'll also notice that the boards call the episode "(The) Spooky Fog", contrary to the speculation that the episode's title may be "The Spooky Fog of Juneberry."
In 2004, a Scooby-Doo direct-to-video film titled "Scooby-Doo and the Anime Invasion" was officially pitched to WB. The film was initially green-lighted and a script was written by Tad Stones, but was later scrapped.
Here's a quote from an interview with him, where he discusses this film.
"My last day at Disney was February 26, 2003. I did one small development project for them that didn't get too far. Then I did a direct-to-video Scooby-Doo script Scooby-Doo and the Anime Invasion. I think it needs a title change, because evidently kids loved the concept but moms weren't sure about it. In the past I'd worked on parts of scripts, or storyboarded parts of my direct-to-videos. This was the first one that I sat down and top to bottom and wrote from blank page to final script. It was a lot of fun to work with those characters."
There are post-credit scenes included in several of the direct-to-video films. In total, there are 7 films which have an extra "hidden" scene beyond the credits.
In 2005, the various Scooby-Doo merchandise in stores generated a total of 1 billion dollars in retail profit since the franchise first began.
Jared Padalecki, who played Sam Winchester on the recent Scoobynatural crossover episode, stated in a recent interview that he had auditioned to be Shaggy in the 2002 live action film. The role was ultimately given to Matthew Lillard, who would later take over for Casey Kasem and work with Padalecki on the Scoobynatural crossover.
Thanks to Scooby Dooby Doo for the video link! :)
Young Sheldon, the brand new spin-off of the hit CBS television series The Big Bang Theory, has shown Sheldon's little sister Missy watching A Pup Named Scooby-Doo twice throughout the series (The series is set in the late 1980's, when A Pup Named Scooby-Doo first began airing). In the ninth episode, the intro for A Pup Named Scooby-Doo can be seen and heard on the television set. Eight episodes later, in "Jiu Jitsu, Bubble Wrap and Yoo-Hoo," a scene from "Chickenstein Lives" is visible on the TV, where Scooby is dressed up as a fortune teller.
This background character casually makes brief appearances in all three of the 1999-2001 films: Scooby-Doo and the Witch's Ghost, Scooby-Doo and the Alien Invaders and Scooby-Doo and the Cyber Chase.
Credit goes to Ryan Hollinger on YouTube for the info and these images in his video. Thanks as well to Thomas, who sent me this video and brought it to my attention! :)
The bat noises at the beginning of the Scooby-Doo, Where Are You? theme song were made by a tape recorder echoing back on itself.
Captain Cutler is the only recurring character in Be Cool, Scooby-Doo! to be voiced by two different voice actors. In season 1's "Game of Chicken," Cutler was voiced by Shaggy's voice actor Matthew Lillard. In season 2's "The Curse of Half-Beard's Booty," Cutler is voiced by Jeff Bennett.
In an interesting parallel, Bennett also took over another recurring character, Mr. E, for one episode only in Scooby-Doo! Mystery Incorporated. This was the only recurring character in that series to have a change in voice mid-series as well.
Despite "Jinkies" being Velma's most famous catchphrase, it was actually first said by Shaggy in "The Dynamic Scooby-Doo Affair" from The New Scooby-Doo Movies while running from the Hooded Person. Surprisingly, Jinkies wasn't said at all in the original series, Scooby-Doo, Where Are You?.