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Full Moon / Student Teacher - S4-E1

Revealing mistake: Full Moon: When Principal Wartz tells Arnold to name the boys who exposed themselves, as Arnold says, "I can't do that, Principal Wartz," his mouth briefly disappears. (00:02:42)

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Full Moon / Student Teacher - S4-E1

Other mistake: Full Moon: When Arnold tells Sid, Stinky, and Harold that he was given four weeks' detention, Harold tells him to not rat on them. Arnold says he won't tell, and when he walks away, his hair passes right through Sid's head. (00:03:30)

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Continuity mistake: When the emotions grab onto the memory vacuum, Anger's left hand is holding the bottom of the vacuum, but in an instant cut, it's on the switch. (00:50:27)

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Helga Blabs It All / Harold the Butcher - S3-E1

Continuity mistake: Harold the Butcher: At Mr. Green's meat store, there are at least two instances that the word "MEATS" is misspelled as "MAETS" on the store's aprons. When Mr. Green gives Arnold the package for Grandma, Green's apron changes to the misspelling. Then, when Harold returns to help Green with the crowd of customers, Harold's apron has the misspelling.

Super Grover ★

Helga Blabs It All / Harold the Butcher - S3-E1

Continuity mistake: Harold the Butcher: After Mr. Green informs Harold that his week is up, Harold follows Mr. Green into the store, and the green front door remains open. Mr. Green explains that he's getting ready for the annual meat sale, and as Harold begs to keep working in the store, we can see in the background that the store's green front door has vanished. The open green front door is back when Harold exits the store. (00:19:05)

Super Grover ★

Helga Blabs It All / Harold the Butcher - S3-E1

Continuity mistake: Helga Blabs It All: While Helga is in the ventilation shaft, when she calls Phoebe for help, the rope is tied around Helga's waist with a knot at the front, but it cuts to a closer shot and the knot vanishes.

Super Grover ★

Tour de Pond / Teachers Strike - S2-E18

Continuity mistake: Tour de Pond: When Rex notices that Arnold's boat is winning and starts running, the red and yellow squares on his grandfather's badge change to red and black. (00:10:18)

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Tour de Pond / Teachers Strike - S2-E18

Continuity mistake: Tour de Pond: When Rex's grandfather walks up to Arnold's Grandpa at the end, his badge has eight squares on it, but in the next shot, it changes to four stripes. (00:11:20)

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Tour de Pond / Teachers Strike - S2-E18

Other mistake: Tour de Pond: When Arnold, Gerald, and Grandpa are first shown at the Tour de Pond race, their ship is not sitting on the sidewalk, but rather on the edge of it, which makes it look like it’s floating in mid-air. (00:05:02)

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Tour de Pond / Teachers Strike - S2-E18

Continuity mistake: Tour de Pond: When Gerald puts the boat made out of the block of wood in the fish tank, the sail is pointing towards the right, but when the boat sinks, it's pointing towards the left. (00:02:18)

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Simmons' Documentary / Big Bob's Crisis - S5-E20

Continuity mistake: Simmons' Documentary: Rhonda wears a black top and red skirt on the day of the documentary, but in one shot, she is wearing her regular outfit. She is also wearing her regular outfit in one shot when the class is watching the documentary. (00:06:12 - 00:11:16)

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Simmons' Documentary / Big Bob's Crisis - S5-E20

Continuity mistake: Simmons' Documentary: When Mr. Simmons explains the documentary and the kids leave the classroom, Arnold is holding a purple book. In the next shot, it changes direction while in his hand. (00:01:50)

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Simmons' Documentary / Big Bob's Crisis - S5-E20

Revealing mistake: Simmons' Documentary: When Phoebe asks Mr. Simmons, "If we're required to do book reports, do we need to choose a book?", her mouth disappears twice. This is easier to see in slow motion, but it's still visible at normal speed. (00:04:27)

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Continuity mistake: When Deep Dark Secret breaks the jar to free the emotions, look at where the emotions are standing, and how the huge piece of glass lands behind them. In about three seconds, the piece of glass changes position, and some of the emotions switch places. (00:33:08)

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Trivia: When the emotions are put into the vault, Pixar's famous A113 reference makes an appearance above the door, in Roman numerals. (00:30:18)

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Party Animal/Ipso Fatso/Don't Yank My Chain - S1-E2

Continuity mistake: Party Animal: When Nutty is stirring the punch, the way he holds the spoon changes between shots. (00:02:45)

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Doggone It/Concrete Solution/Sea What I Found - S1-E3

Continuity mistake: Doggone It: When Pop and Cub enter the pet store, there is a bird cage hanging from the ceiling. Then when Pop picks up the dog, it disappears. (00:00:58)

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Idol Curiosity/Home Is Where the Hurt Is/Aw, Shucks! - S1-E9

Continuity mistake: Home Is Where The Hurt Is: When Handy walks out of the house at the end, he leaves the door open behind him, but in the last shot of the episode, it's closed. (00:14:12)

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Idol Curiosity/Home Is Where the Hurt Is/Aw, Shucks! - S1-E9

Continuity mistake: Home Is Where The Hurt Is: When Lumpy sees the two purple doors, he opens one of them and kills The Mole. A shot later, they change to dark pink, then back to purple. The door frame also disappears, then reappears. (00:12:53)

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Land of Hold/Penny Henny - S2-E17

Deliberate mistake: When Garfield brings Jon to the broken TV, the scene's animation is still unrendered. (00:01:04)