Actor Allusion: It's no coincidence that Daphne's Xenafication in the live-action film comes along when she's being played by Buffy. Also, her line, "This must be the secret relic thingy they worship," could be considered Buffy Speak.
In an episode of What's New, Scooby-Doo?, when Daphne meets someone hired to impersonate her, she complains she is being played by an extra and asks whether Sarah Michelle Gellar was busy.
Beam Me Up, Scotty!: Velma is notorious for always losing her glasses. In the original episodes she only dropped them twice. The same goes for Daphne getting kidnapped, it really didn't occur that often enough to be her recurring character trait in the original series.
Actually, Velma had her glasses knocked off her face, once by Scooby, the other time after bumping her head. A third time, a bat plucked her glasses off and dropped them on Scooby's head, and a fourth instance had her glasses swept off her face from an errant bumper cart. And later, in "That's Snow Ghost," Scooby uses Velma's glasses to see the bundle of dynamite pursuing them on the log behind.
Velma losing her glasses became a running joke based on her voice artist, Nicole Jaffe, whose glasses fell during a script reading, and she was quoted as saying, "I can't see without them."
Lampshaded in the Johnny Bravo ep "Bravo Dooby Doo" after Velma and Johnny both grope for their displaced eyewear:
Velma: My glasses! I can't see without my glasses!
Johnny: My glasses! I can't be seen without my glasses!
"Old Man Jenkins" has become the term for the everyman Scooby-Doo villain. While there was a suspicious old man named Mr. Jenkins in one episode of the original series, but he turned out to be innocent.
Channel Hop: From CBS to ABC in 1976. NBC may even count, as Dynomutt was paired up with Godzilla for an hour-long show in 1981 on that network and the Scooby gang's appearances in Dynomutt were subsequently aired.
And the deleted animated opening, and Velma's song; when Mondavarious says that:
She knows that Bloody Scars are not alcoholic, doesn't she?
And finally a scene where Daphne's soul is extracted from her body and a demon possesses her.
Dyeing for Your Art: For the live action film, blond Sarah Michelle Gellar note Though she is a natural brunette dyed her hair red to become Daphne. Additionally, brunet Freddie Prinze Jr. bleached his hair blond to play Fred. Also, redhead Isla Fisher became a blonde to play Mary Jane.
Edited for Syndication: Footage from Act II of the very first episode, "What a Night for a Knight", is missing. It's where the gang is outside the museum as Fred is unable to open the rear door. He gets a ladder out of the Mystery Machine (which must be dimensionally transcendental to hold a ladder) and volunteers Shaggy to climb up and go in through a window high above.
Shaggy: Why me?
Fred: Because that's a small window and you're the thinnest.
In the first season of The New Scooby-Doo Movies, scenes running roughly a minute and a half were made but not used until season 2. The scenes never showed up in syndication, CN/Boomerang airings or DVD releases. Among the scenes were Jonathan Winters flipping a coin with Shaggy to see who would go up to the grist mill window ("The Frickert Fracas"), and Scooby trying to get the kids' attention to tell them he found a secret passage out of Moody Manor ("Guess Who's Knott Coming to Dinner").
In the 1970-71 season, a minute of footage from season 1 episodes of Scooby-Doo, Where Are You! were cut to make room for CBS's "In the Know" interstitials. ("In the Know" were 2½-minute educational capsules hosted by Josie and the Pussycats. It would be replaced the next season with CBS's long-running interstitial series In the News.)
Hey, It's That Guy!: There's an on-camera appearance by Lisa Ann Beley toward the beginning of Monsters Unleashed as one of the "Mullet Nerdettes" at the grand opening of the museum.
The theme song has been sung by bands such as Third Eye Blind and Billy Ray Cyrus.
Matthew Sweet does a terrific version of the theme on the 1995 album Saturday Morning Cartoons' Greatest Hits.
Madelyn Dinkley, Velma's sister in "Abracadabra Doo", is voiced by Danica McKellar, who was best known as Wonder Years cutie Winnie Cooper.
Tim Conway (The Carol Burnett Show), who voiced himself in a 1973 episode, voices Skip Jones—Fred's dad—in the 2006 DVD movie Scooby-Doo: Pirates Ahoy!
Jay Leno voices Jack O'Lantern in Scooby-Doo and the Goblin King.
And the eponymous King is Tim Curry, who also played Ben Ravencroft in Witch's Ghost and the Mastermind in the Night of 100 Frights video game, among other roles in the franchise.
Kellie Martin (Becca on Life Goes On) was Daphne's voice on A Pup Named Scooby-Doo.
Really, each incarnation is filled with this. Casey Kasem is probably the most popular, since he voiced Shaggy for about 40 years. Frank Welker also voiced Fred from the beginning, and started voicing Scooby as well. The original voice of Scooby was Don Messick, one of the most famous voice actors of the 1960s and 1970s.
Mark Evanier tells of a charming yet bittersweet tale about Messick. He was at Hanna-Barbera doing a recording session in 1997, when suddenly, he left, stating he couldn't do voices any longer. Everybody present sensed that Messick was retiring, so they held a retirement dinner for him. Guests did speeches, and then Messick stepped up and said "Thank you" to everyone in Scooby-Doo's voice. One guest said, "Don spent years giving Scooby-Doo his voice, and now Scooby's helping Don to express himself."
The full complement of voice actors throughout the Scooby-Doo animated timeline:
Name's the Same: "Roller Ghoster Ride," the unused Either/Or Title of the Pup episode "Terror, Thy Name Is Zombo," is also the title of a What's New episode. "Wrestle Maniacs" is also a title of an episode of both series.
The Other Darrin: The show went through many voice actors. The only cast member to stay consistent throughout the whole series (save for A Pup Named Scooby Doo) is Fred.
Mostly averted in Brazil, with only Fred not having his original actor as of "What's New…", basically the inverse of English. While the other teens' actors are now in their 70s (Scooby's in his 90s), Fred's new voice actor is in his early 30s, and he sounds believably like a teenager.
Obviously, the English voice actors haven't been 100% consistent, but considering the franchise has been running for over 40 years, this is understandable.
The Japanese-dubbed version of the live-action films have a top-notch cast with all the main characters:
Romance on the Set: Daphne's and Fred's actors in the movie were, of course, a real-life item.
Screwed by the Network: When CBS brought Where Are You! back in 1974 after a two-year hiatus, Hanna-Barbera wanted to make new episodes. But CBS felt they could get just as much mileage, if not more, from repeats. CBS would cancel Scooby on August 7, 1976, a full month before the new season began. A week later, Scooby (which moved to ABC a month later) was replaced on CBS with Scooby clone Clue Club.
Scooby with Scrappy after Don Messick took the voice.
From Witch's Ghost to Cyber Chase he and Shaggy were both voiced by Scott Innes. Since Scooby and Shaggy share most scenes together, that's quite an accomplishment.
Since 2002, Frank Welker has been the voice of Fred and Scooby.
What Could Have Been: Hanna and Barbera reflected in a later interview that the show was originally just going to be about 'a group of teenagers solving crimes', but 'we threw in a dog, and he turned out to be the star of the show'.
The dog was originally a sheepdog named Too Much, but The Archie Show (which was also on CBS) already had Hot Dog, Jughead's pet sheepdog. An H-B staffer raised Great Danes as a hobby, so they made the dog a Great Dane. It was Fred Silverman and (indirectly) Frank Sinatra who gave the dog the name Scooby-Doo.
In its developmental stage as "Mysteries Five", there were originally five kids who, in a knockoff of The Archie Show, played rock music as well as solved mysteries. Their names were Geoff, Mike, Kelly, Linda, and W.W. (as well as their bongo-playing sheepdog, Too Much). Geoff and Mike were melded to become Fred (originally Ronnie but renamed after CBS programming head Fred Silverman), Kelly became Daphne, Linda became Velma and W.W. became Shaggy.
In the original pitch, Velma and Shaggy were siblings. It showed in the debut episode, "What a Night for a Knight", as Velma has Shaggy's cough medicine at hand, and in "Decoy for a Dognapper" ,Shaggy keeps a spare pair of glasses for Velma.
Scooby-Dooby Doors: It may be one of the most frequently referenced sequences in any Hanna-Barbera/Warner Animation production, if not all of western animation. Yes, that's right, Scooby-Doo is the Western equivalent of Neon Genesis Evangelion.
The gag had been used in Looney Tunes shorts long before that. One of the oldest uses was in a live-action silent comedy made in the early 1920s. Amusingly, it took place in a haunted mansion, and the ghost was revealed to be a fake.