Dying to undo the moment when all fell apart

I decided to do a pointless trivia on Scooby-Doo! I don't know much about the series so this may be very short.

Despite being a popular reference to the series, no villain in the original Scooby-Doo, Where Are You! series ever said the exact phrase "And I would have gotten away with it, too, if it hadn't been for you meddling kids." Most villains referred to the gang as "meddlers", rather than "meddling kids", and they often simply said nothing as they were taken away. The closest the original series comes to the line is in the episode "A Gaggle of Galloping Ghosts", where the villain says "I'd have gotten away with it, too, if it wasn't for those blasted kids and that dog!" However, the phrase does appear in some of the newer series, as a nod to the fandom. When discussing the show's success, character designer Iwao Takamoto said "And I got away with it thanks to those meddling kids and their dog." The first time they're actually referred to as "meddling kids" in the show is in the Season 2 episode "Scooby's Night with a Frozen Fright", where the villain says "And it would've been mine if it weren't for these meddling kids!"

Shaggy's real name is Norville Rogers. Despite being thought of as a stoner stereotype, the writers have said he was actually supposed to be a stereotype of 1960's beatnik culture.

The episode "Bedlam in the Big Top" features a circus lion named Simba (Swahili for "lion"), 25 years before The Lion King was released.

Velma's catchphrase of some variation on "I can't see without my glasses!" was not in the original script. Velma's voice actor, Nicole Jaffe, was also near-sighted, and during a table read she lost her glasses and said a variation on the line. The writers liked it so much that they made Velma losing her glasses one of the trademark running gags of the series.

The series wasn't originally going to have Scooby in it at all. The original concept for the show was simply a bunch of teenagers solving crimes, but as the writers said, "We threw in a dog, and he turned out to be the star of the show."

However, the dog introduced was not Scooby, or at least not as we know him. He was originally a sheepdog named Too Much, but The Archie Show, which was airing on CBS (where Scooby-Doo, Where Are You! originally aired) already had Jughead's pet sheepdog Hot Dog. One of the staff members at Hanna-Barbera happened to raise Great Danes as a hobby, so they decided to go with a Great Dane. The name "Scooby-Doo" was chosen by Frank Welker (voice of Fred and Scooby) after a scat-singing segment in the song "Strangers in the Night" by Frank Sinatra.
 
The writers of the original show found Fred and Daphne boring, which is why they're rarely shown searching for clues when the gang splits up. 

Originally there were five kids, who also played rock music as well as solved mysteries (similar to The Archie Show). Their names were Geoff, Mike, Kelly, Linda, and W.W. Geoff and Mike were merged to become Fred (who was originally named Ronnie, but renamed Fred after Fred Silverman, head of programming at CBS), Kelly became Daphne, Linda became Velma and W.W. became Shaggy.

Velma and Shaggy were originally going to be siblings, as evidenced by the debut episode "What a Night for a Knight" in which Velma has Shaggy's cough medicine and the episode "Decoy for a Dognapper" where it's shown that Shaggy keeps a spare pair of glasses for Velma on hand. 

Working titles for the series included Mysteries Five and Who's S-S-Scared?

It's often mistakenly claimed that Fred doesn't have a catchphrase. In fact, Fred has several catchphrases, the most notable among them being "Looks like we have another mystery on our hands, gang" and "Let's split up and search for clues". However, since his tend to be longer and less punchy and memorable than the others' (such as Shaggy's "Zoinks!"), they tend to not stick in people's mind as catchphrases so much.