AidanN

Show generally

Audio problem: Right after Helga is standing behind the "ARNOLD" on the pavement, when she says "Hey Arnold", her lips move as if she's saying it slowly (this is fixed in the 4th season).

AidanN

Show generally

Other mistake: In the closed-captioning, when Arnold and Gerald "touch thumbs" (and you hear that "sproing" sound), the caption says "[glass shatters]"

AidanN

Show generally

Continuity mistake: The first time you see the line of girls, Rhonda's shoes are "low-cut", but just before Helga says "Move it, football head", the shoes suddenly extend much higher (like they normally do in the stories).

AidanN

Show generally

Continuity mistake: When the four boys form their line (just before the adults call out "Arnold"), watch Harold's tooth; it goes from the right side of his mouth (as you look at him) to his left side.

AidanN

Beaned / Old Iron Man - S5-E11

Continuity mistake: When Arnold reads to Helga, the book title says "GEO-" and "GRAPHY" (two words); the next day, it says "GEOGRAPHY" (one word).

AidanN

Stuck in a Tree / Rhonda Goes Broke - S5-E10

Other mistake: In the scene after the garbage dumpster scene, Buckley's lips disappear briefly while he's talking.

AidanN

Parents Day - S5-E6

Continuity mistake: In the scene where Arnold's parents leave for the last time, Grandma's hair is dark at first, then it becomes purplish-gray.

AidanN

Married - S5-E16

Character mistake: The first time Arnold tries Rhonda's marriage predictor test, he says his favorite number is five, but Rhonda actually makes six moves. The second time, Arnold says it's three, but Rhonda counts off four.

AidanN

On The Lam / Family Man - S5-E17

Character mistake: In the wrestling match, the bell rings after the referee counts to 3 - but he's counting while a wrestler is on the mat stomach-first; a pin requires the loser to be on his back.

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Parents Day - S5-E6

Continuity mistake: In the tricycle section of the last event, the chinpiece of Helga's helmet keeps switching colors.

AidanN

Love and Cheese / Weighing Harold - S4-E7

Continuity mistake: Lila was pretty much entirely underwater in a "standing" position when Arnold rescued her, how come suddenly the water only reached her knees?

AidanN

Big Gino / Jamie O. In Love - S4-E2

Other mistake: In the cafe, after Charice speaks, when Gerald says "Aloha, Gladiators on Ice", there are three places where Gerald's mouth disappears.

AidanN

Dinner for Four / Phoebe Skips - S4-E5

Other mistake: When Helga and Phoebe leave the girls' bathroom together near the end, Helga pushes the door outward, but the hinges are on the inside, so it should only open inward.

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Weird Cousin / Baby Oskar - S4-E11

Factual error: Stephen Viksten is credited twice for voicing Oskar.

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Monkeyman! / Buses, Bikes and Subways - S5-E1

Trivia: The banana warehouse at the dock says "ROB RTSON" on top; Chris Robertson is one of the show's artists.

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It Girl / Deconstructing Arnold - S4-E9

Continuity mistake: When Eugene breaks into the area with the dogs, you see the pedals of his bike tossed into the air, but the pedals fell off on the other side of the street.

AidanN

Sid's Revenge / Roller Coaster - S3-E8

Trivia: There are two versions of this episode. Originally, the closing credits appeared over the ending scene with Eugene going around and around in the roller coaster. When Nickelodeon switched to its "squeezed" credits format, a second version was created with the credits removed from that scene, and a new set of credits (over the "normal" credits background) added to the end. (This was later done with "Principal Simmons" as well.)

AidanN

Career Day / Hey Harold! - S3-E11

Continuity mistake: There are more than 16 slips in the hat, but only 16 students in class, and only 12 hands went in to pull out slips.

AidanN

The Aptitude Test / Oskar Gets a Job - S3-E9

Plot hole: Mr. Simmons asked that each student put their name on the test folders, but the folders already had names on them when he handed them out.

AidanN

The Aptitude Test / Oskar Gets a Job - S3-E9

Revealing mistake: The test paper Eugene put back in Harold's folder is blank.

AidanN