When Velma sneaks off to follow Mr. Crunch, Freddy organizes a search for her. He should've simply turned around, because in the very next shot she is right there behind him.

The Dynamic Scooby-Doo Affair (Batman and Robin)

Scooby-Doo Meets the Addams Family

Frickert Fracas (Jonathan Winters)

Guess Who's Knott Coming to Dinner (Don Knotts)

From our vantage point outside the house, we see Don Knotts move past the first and last in a series of windows, although we never see him in the middle windows.

When Scooby falls down the chimney, it scares him spotless, for a few seconds, anyway.

Is Daphne mocking Velma when she speaks in a perfect imitation of her voice?

We know that Phineas Fo'c'stle's peg leg is a fake, but is that any reason for him to wear it on different legs at different times?

When Scooby puts a banana on top of his sandwich, his paw is momentarily peach-colored instead of brown making it look more like a human hand than a paw.

While running from the ghost, Shaggy bursts through the bedroom door, flattening Scooby between the door and the wall, then slams the door to keep the ghost out. We then see Scoob,still splatted against the wall, but the door is open again.

The gang finally finds Capt. Moody tied up in the old mine. Although they were standing only a few feet away from him for some time talking, the captain never once called out for help.

A Good Medium Is Rare (Phyllis Diller)

Shaggy and Scooby slide down a laundry chute and land in a basket. A moment later, we see Shaggy & Daphne in the same basket while Scooby has one all to himself.

Sandy Duncan's Jekyll and Hydes

The Secret of Shark Island (Sonny and Cher)

The Spooky Fog (Don Knotts)

Shaggy actually jumps behind the mine car, but a moment later he's inside it.

Scooby loses his spots several times during this episode.

In the cave, we see a hairy brown paw push over Shaggy's rock pyramid. Who, or what, is this? The baddies are dressed in skeleton costumes.

We hear Shaggy yell while in the mine car, although his mouth doesn't move for the second and third scream; they must be echoes

A spider web in the mine is floating, not attached to anything on one side. Is it a fake placed there by the villains for atmosphere?

The rope Don ties around his waist has three ends, one at the top of the pit, and two visible at the knot. Did it break?

Scooby-Doo Meets Laurel and Hardy

At the very beginning of the episode, Shaggy is in the front seat, but seated behind Velma, as though she is sitting on his lap. Then he is in the back, then in the front again.

Shaggy is suddenly seen wearing his shirt, instead of the pajamas he had on a moment before.

Shaggy says he won't put on his skis until he reaches the top of the hill. In the next scene, he's shown wearing his skis on the chairlift, but without them again when he reaches the top.

Freddy & Hardy see a sheet standing in the middle of the room with Bigfoot's toe sticking out the bottom. When they tackle it, they find it's only Stan Laurel under the sheet. How could Bigfoot sneak out from under it with everyone standing there watching?

Scooby sneezes so hard that he shoots himself across the room and bumps into a clue, not once, but twice in a ten-minute interval! He ought to sneeze more often.

Hardy keeps switching from one bed to the other.

Velma talks without moving her lips.

Freddy says, "Look, footprints", when he'd already been following them for ten feet.

Velma says the boys room is next door & Laurel & Hardy across the hall, but it's the other way around

When Hardy sees someone on the second floor of the junkyard office, he immediately gets a ladder to climb in the window. Why didn't anyone think of trying the stairs?

Scooby follows Bigfoot's tracks, but suddenly they're gone, then back again.

When Velma looks out the bedroom window at Bigfoot, she puts her head right through the glass.

The Ghost of the Red Baron (Three Stooges)

The Ghostly Creep from the Deep (Harlem Globetrotters)

The Haunted Horseman of Hagglethorn Hall (Davey Jones)

In this episode we learn that Shaggy is allergic to hay. However, in Jeepers, It's the Creeper he finds himself trapped in a bale of hay with no noticeable ill effects. He must have remembered to take his allergy medication that day.

The gang has a hard time following the moat monster's trail, until Velma points out that his footprints would be side by side when he hopped like a frog, and staggered when, unmasked, he ran like a man. Good deduction, Velma, except we saw the moat monster run, not hop, even before he was unmasked.

The old farmer who disguises himself as th Moat Monster is quite an athlete. He hops and runs all over the cavern wearing an oxygen tank and swim fins; he also breaks off a huge stalactite with his bare hands.

The Phantom of the Country Music Hall (Jerry Reed)

The Caped Crusader Caper (Batman and Robin)

Joker and Penguin are awfully confident that Prof. Flakey will never be able to find the hidden switch that opens the secret door to the room in which he's trapped; they trip the mechanism right in front of him and just leave him there. It's a pretty safe bet that the Professor will simply keep trying until he finds it.

Loch Ness Mess (Harlem Globetrotters)

The Mystery of Haunted Island (Harlem Globetrotters)

The Haunted Showboat (Josie and the Pussycats)

Jeannie

Spirited Spooked Sports Show (Tim Conway)

The Exterminator (Don Adams)

The Weird Winds of Winona (Speed Buggy)

The Haunted Candy Factory (Cass Elliot)

Scooby-Doo Meets Dick Van Dyke