Name Drop: In "The Frickert Fracas" (Scooby-Doo Movies ep with Jonathan Winters), Maude Frickert tells Fred he looks like Glen Campbell.
A name drop through tagline: In Scooby Doo Meets The Addams Family, Scooby's "I ate the whooooole thing!" referred to the tagline of an Alka-Seltzer commercial prominent at the time, which was "I can't believe I ate the whooooole thing!"
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 Only Ones: Vincent Van Ghoul makes it clear that Scooby and Shaggy are the only ones who can get the 13 ghosts back into the chest of demons, because they're the ones who let them out.
Only Sane Man: or girl, in this case—Velma in Music Of The Vampire. Although she does get a strange snark in when Daphne disappears and it is learned that the vampire seeks a bride with "beauty and is pure of heart."
Velma: You know, I'm pure of heart. Does anyone ever think of kidnapping me?
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.
Our Ghosts Are Different: From The 13 Ghosts of Scooby Doo right down to the last ghost. While they are all referred to as ghosts, the series goes back and forth on whether they're actual demons or something else entirely. A couple of them even seem more like rival magic users to Van Ghoul rather than actual spirits.
Outdated Outfit: The gang's original 1969 outfits usually get copied, but a few adaptations give them fashion makeovers.
This is lampshaded in one of the made-for-TV movies. Fred is seen getting dressed, and he puts on the orange tie he wore in his original outfit. He thinks about it for a few seconds, then says "Naaah," and takes it off.
Lampshaded in Scooby Doo and the Cyber Chase where the gang meet digital models of themselves from years earlier, who are still wearing the original outfits. For most of the segment, it's the only way to visually tell the two groups apart. Fred also gives himself a comment on the ascot.
The two made-for-TV live-action obviously deviates a a little from the gang's appearances — Fred has dark hair. This is subverted and lampshaded in Curse Of The Lake Monster: Fred and Daphne pose as mannequins to lose the trail of the creature, and they are both done up as the original cartoon Fred and Daphne. After looking in a mirror, Fred thinks it's a good look. Daphne thinks he's being ridiculous.
In "Decoy for a Dognapper", while warding off a flock of bats, Velma kicks her knees up high enough to show her panties, but they are colored the same as her skirt.
In "Scooby's Night With A Frozen Fright", she, Shaggy and Scooby get startled at the door slamming behind them and you can see her panties which are the same color as her dress.
In The Spooky Fog, a scene where Velma jumps back after being scared by a small animal, causing her skirt to flip up briefly, was unused during the first season of The New Scooby Doo Movies. It was added in season 2; it has not resurfaced since going into syndication and subsequent Cartoon Network and Boomerang airings.
In "A Good Medium Is Rare", Velma's skirt rides up as she, Daphne and Fred react at a mysterious figure behind them.
In the "Mystery of Haunted Island," one occurs when the gang meets the Harlem Globetrotters. A mishap with the door leads to the gang being pulled into a pile with the Globetrotters, where Daphne ends up face-down with her skirt flipped up, exposing her panties underneath her trademark pink tights. And here's the shot. She's on the left.◊
In the episode "The Babysitter from Beyond" (A Pup Named Scooby Doo), the kids are wedged in a doorway and from behind we can see Velma's and Daphne's white panties. Curiously, Daphne is wearing her panties on the outside of her tights. Wearing a second pair of panties over one's tights is an old trick to help stop them falling down.
In "A Bicycle Built For Boo," Velma's skirt flips up after Scooby drops her from the reach of the episode's monster. Given Daphne and Velma's ages in the show, this would fall under innocent panties territory.
In "Wanted Cheddar Alive," the gang is chasing the guy in the blue suit until Daphne's skirt flips up to show her panties. Meanwhile Daphne and Fred jump up higher then fall down to show Daphne's pink panties.
In "Mayhem Of The Moving Mollusk," the gang has been thrown into dumpster causing Daphne's dress to get dirty. She calls her butler Jenkins; as Daphne climbs out of the dumpster to show her pink panties.
In "It's Mean, It's Green, It's the Mystery Machine" from What's New, Scooby-Doo when the Mystery Machine is chasing the gang and Velma falls over, flipping up her skirt in the process to show her white panties.
In The 1976 episode "Mamba Wamba And The Voodoo Hoodoo Fred and Velma set the trap On Mamba Wamba causing Velma's Skirt to get flipped up and exposing her red solid panties.
In the 1976 episode "Scooby Doo, Where's The Crew?", on Prof. Poisson's ship, Velma stands on tiptoe to look into the radio room porthole. Her skirt rides up high enough to show her red lace-trimmed panties.
In The 1976 episode "There's A Demon Shark In The Foggy Dark", The Gang headed toward Aqualand when they see the demon shark chasing them. They headed to the pool riding on a dolphins' tail and landed in the trampoline to show Velma's red panties and Daphne's black panties.
In 1978 episode "Creepy Creature Of Vulture's Claw the gang heads to the old aaretaker's cabin to open the door to save Daphne; in the process it showed her black panties.
In 1984 episode "Scooby's Peephole Pandemonium" after the gang heads to Norman Deathman's bedroom Daphne and Scrappy hide under the bed to show her upskirt of her panties.
Monsters Unleashed has Velma jumping into a ship vent funnel, back to the camera. Her orange panties can be seen for a couple of frames.
Daphne gets one in Curse of the Lake Monster. Wearing a pleated-skirt tennis outfit, she (as well as Fred and Shaggy) gets knocked backwards by the lake monster.
Relationship Upgrade: Shaggy and Velma from the looks of it in the new series. Since scuttled as of episode 10, and as a result, Velma is mad at both Shaggy and Scooby.
Replaced the Theme Tune: The later seasons did away with its iconic "Where Are You?" theme song in its entirety. Many fans assert that this change coincided with an overall drop in the show's quality as it preceeded the introduction of The Original Scrappy by one season.
Romantic False Lead: In the first few direct to tv movies, such as Zombie Island and The Witches Ghost, there would always be at least one character that Fred or Daphne would have a crush on, solely so that the other wound up being jealous and inducing Ship Tease.
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.
Ship Tease: Between Fred and Daphne, so, so, so, so much.
It seems to be heading this way too for Velma and Shaggy in Mysteries Inc.
In the latest DVD movie, Camp Scare, Fred and Daphne are seen walking hand in hand into the woods at the start of the first musical number while Velma and Shaggy still have a working and platonic relationship.
Spanner in the Works: Shaggy and Scooby act as this in Zombie Island; Samone and Lena dismiss them, and they end up disrupting the ritual long enough for the others to turn the tables.
Special Guest: Luminaries that appeared in cartoon form on the show: Jonathan Winters, Don Knotts, Phyllis Diller, Sandy Duncan, Sonny and Cher, Jerry Reed, Davy Jones, Tim Conway, Cass Elliot, and Dick Van Dyke. The Addams Family appearances re-recruited John Astin and Carolyn Jones as the voices of Gomez and Morticia. And Pugsley Addams was voiced by a young lady by the name of — you may have heard of her — Jodie Foster.
What's New, Scooby Doo? had guest appearances by hockey's Brett Hull, baseball's Mike Piazza, skateboarder Chris Krug, Steve Harwell of the group Smashmouth, and music group Simple Plan. Episode 11 of Scooby-Doo! Mystery Incorporated featured author Harlan Ellison.
Speech Impaired Animal: Lampshaded in Scooby Doo and the Alien Invaders; Crystal and Amber [Shaggy and Scooby's love interests in that film] are revealed to be aliens at the end, and Amber, the dog, can talk.
According to studio bios from the cast we know, Fred and Shaggy are 17, Daphne is 16 and Velma is 15. A Pup Named Scooby Doo would chronologically have Fred and Shaggy at age 10, Daphne at 9, and Velma (who in this series sleeps in a jumper) at 8.
Stalker with a Crush: In What's New, Scooby Doo?, Velma has one in the form of an inventor nerd named Gibby Norton.
In "Bravo Dooby Doo," Velma flirts with Johnny Bravo.
Velma: (winks to Johnny) I don't bite!
Johnny: (points to Daphne) Yeah...but does she?
In Scooby-Doo: Camp Scare, a ranger investigating the destruction of Camp Little Moose flirts with Velma, who is squicked.
The Stoner: Shaggy. Okay, so the show never actively says he's The Stoner but he's stick thin, scruffy, always hungry, will eat dog snacks, thinks his dog can talk (the others could be humoring him or are probably as wasted as he is), and he's always freaking out. Who cares if the show never dared to canonise it?
Only creators Joe Ruby and Ken Spears could vouch for it. The show was created for the 2-11 age bracket on Saturday mornings after all.
According to the show's creators, the idea that Shaggy did pot never even entered their heads in the creation of the character. But since it was brought up, a lot of the movies have a tendency to joke about it. And fans believe it.
Story Arc: "Scooby Doo: Mystery Incorporated" has one of these, with the mysterious Mister E sending them clues about their latest mystery and challenging them to solve the disapperance of a previous band of mystery-solving teens years ago.
In the movie Looney Tunes: Back in Action, Scooby and Shaggy are seen in a studio cafeteria threatening Matthew Lillard, who played Shaggy in the 2002 and 2004 live-action Scooby theatrical feature films (averted seven years later, when Lillard would assume Shaggy's voice on the cartoon).
Shaggy: What kind of performance do you call that? You made me sound like a total space cadet, man!
Matthew Lillard: I'm sorry you feel that way. I was just trying to be true to your character.
Shaggy: If you, like, goof up on me in the sequel, I'ma coming after ya!
Scooby: Reah. And Ri'll rive you a Scooby Snarl! [growls viciously]
In "Curse of the Lake Monster" the jab about relationships in the end seems to be one directed towards Mystery Inc.
Take the Wheel: In Monsters Unleashed, when the gang is being chased by the pterodactyl monster, Freddy asks Shaggy to take the wheel of the Mystery Machine while he tries to shoot the monster down. A little while later, Shaggy gets called to the back of the van so he can help Velma, and he leaves the driving to Scooby. To Scooby. Granted, he's pretty intelligent as far as animals go, but he's still not that far up the scale...
Tangled Family Tree: Each series/spinoff seems to insist on introducing (and, with few exceptions, never showing again) more and more relatives of the gang... cousins, uncles, aunts, grandparents, parents (Fred's and Shaggy's parents in Mystery Inc. are different than was previously presented), and in some spinoffs, even siblings. At this point, the Rogers, Dinkley, Blake, Jones and Doo family trees' must rival the (Mc)Duck family tree in complexity...
10-Minute Retirement: Happens twice. In the prime time special Scooby Goes Hollywood, he quits his Saturday morning show to pursue a career in nighttime TV. In the 13 Ghosts episode "It's a Wonderful Scoob," he becomes so traumatized by the episode's Big Bad that he goes back home to his parents. In the first instance, Fred, Daphne and Velma lead a rally for Scooby to return to his cartoon show. In the second, Vincent Van Ghoul shows Scooby the future world without him stopping the villain Time Slime.
There Are No Adults - They either don't have parents or their parents just don't care that their teens travel around the world solving mysteries with a talking dog.
Mystery Incorporated subverts this, with their parents appearing frequently to try to get them to stop solving mysteries, because in this world that's what rebellious teens do apparently.
Those Two Bad Guys: Bogel and Weerd from The 13 Ghosts of Scooby-Doo, a pair of bumbling ghost minions who bounce their services from demon to demon, but consistently mess up.
Toilet Humor: Shaggy in Legend of the Phantosaur when the biker picks him up:
Shaggy: And there goes the bladder!
Took a Level in Badass: Daphne in the current run of feature-length cartoons, What's New and the live-action films. While sometimes still filling her classic damsel role, she now has martial arts skills, frequently gets the gang out of trouble by MacGyvering their way out of a trap with items in her purse and generally seems no more helpless than Fred or Velma.
It happened even earlier than that. In The Thirteen Ghosts Of Scooby Doo, she turned in her purple dress for a jumpsuit and went off with Shaggy and Scooby to hunt down actual ghosts.
Shaggy turns it up to eleven in Legend Of The Phantosaur, provided the key word is given to him at the right time.
Vague Age: The Mystery Gang. They're only described as "Meddling Kids," but considering how much time they spend on the road, they almost certainly have to be in their 20s, or late teens at the youngest.
Their ages have been given, for the original series at least. Velma is fifteen, Daphne is sixteen, and the boys are seventeen. The original premise was to have them be a teen rock group on tour, which makes the lack of parents and time on the road more explainable.
Verbal Tic: Like, Shaggy, obviously. Also of note, Professor Flakey in 1972's "The Caped Crusader Caper", one of two crossovers with Batman and Robin. Flakey's dialogue consists almost exclusively of spoonerisms and this memorable malapropism:
Flakey: I always liked Shaggy because he's dumb to kind animals!
Video Wills: The phonograph record in "A Night of Fright Is No Delight".
The Walls Are Closing In: In "A Night of Fright Is No Delight", the gang discovered a locked trap door and a nearby organ that appears to control it. Scooby offers to play the organ to see whether they can open the trap door, but when that happens, the gang realizes the walls are closing in on them. As the gang tries to hold the walls back, Scooby desperately plays the instrument more, and then frantically dances on the keys to try to get it to stop the walls, and succeeds by sheer luck.
The message on the sheet music read, "Feed the organ and watch the floor," and Velma deduced that it meant the musical notes F-E-E-D, which she plays and a panel in the floor opens. As to which keys Scooby pushed to stop the walls, that is anybody's guess.
What Could Have Been: "Mysteries Five" and "Who's S-S-Scared?", were titles originally chosen for the (then) in-production series "Scooby Doo Where Are You!"; Just as well, Fred was once two separate people (named "Geoff and Mike"), Kelly and Linda soon turned into Daphne and Velma, respectively; Shaggy (Linda's brother) was once "W.W.", and Scooby-Doo happened to be a sheep dog named, "Too Much", rather than a Great Dane.
Scooby Doo: Music Of The Vampire: Shaggy and Scooby are told by swamp hermit Tulie that his prototype for hovering shoes was stolen by the vampire. When the gang catches the vampire, this is never brought back up. Likewise, we never see Jasper Poubelle and his vampire-hunting posse at the conclusion.
Who Is Driving: Zig-zagged twice in the episode "Foul Play In Funland." First, Velma and Scooby are in a runaway bumper car which Velma can't control after losing her glasses (and she even taps her foot on the floorboard searching for a brake, which bumper cars don't have). Then, the gang is helping Mr. Jenkins find his recalcitrant robot in a jeep, which Velma's driving. She's only fifteen! Does she have a permit?
And after the ride in the bumper car, where is Scooby sitting in the jeep Velma is driving? Shotgun!
Velma does show some mad skills with the Mystery Machine in Scooby Doo: Music Of The Vampire.
Daphne:(having just overpowered Zarkos) Now who's the damsel in distress?
Daphne: Straight up!
Who Would Want to Watch Us?: In Scooby-Doo and the Cyber Chase, the newly redrawn cast mock their original appearances in a video game based on them. (Cyber!Shaggy, however, is wearing his red shirt from a couple of the movies.)
Why, Thank You, X: This happens a lot in Scooby-Doo, especially when Scooby and Shaggy decide to cook or just fool around after splitting up. The monster/ghost makes an appearance handing them something or offering a suggestion before they see it and run for their lives.
It also happened to Velma when she was in a college lab testing a mummy's bandages to find out if they were really ancient and the mummy handed her a test tube with the right chemical in it. (In retrospect, it's also kind of a clue that the mummy is one of the professors.)
Wild Wilderness: Well there are several locations from swamps to forests to islands to...well you get the point. They have to many adventures to really point this out to often but this trope swings in and out often.
Writing Indentation Clue: One episode has Fred, Velma and Daphne come across someone's diary whilst looking for clues. They find that the ink of the text has faded, but the pressure of the pen has worn through to the next page. So one of them grabs a coal and shades the paper to see what was written.
Not to mention that there were never any witches burnt at the stake in America. They were either hanged, crushed with stones, or sentenced to imprisonment.
Younger Than They Look: They look like teenagers to you? Possibly lampshaded in the Valentine's Day special of What's New, Scooby Doo? where a flashback shows a much more teenage-looking Shaggy breaking up with his then-girlfriend. (It's a little subjective, but the beginning of Zombie Island heavily implies the characters are now college-age and subsequent animated versions of the franchise usually seem to tacitly follow suit even if the continuity is often vague...)