Hey Arnold!

Girl Trouble / School Dance - S3-E18

Continuity mistake: Besides the fact that when Helga is sharpening her pencil, the desk arrangement changes, one of the students visible when she looks at Arnold is...Helga.

Hey Arnold! mistake picture

Mud Bowl / Gerald Moves Out - S2-E9

Continuity mistake: When Gerald catches his little sister destroying his cassette tape, the book she is wrapping changes color from blue to green. (00:12:30)

Longest Monday / Eugene's Pet - S2-E4

Continuity mistake: In "Longest Monday" at one point in the episode, Arnold and Gerald run off of a bus and down an alley. Two fifth graders come chasing after them. In the next scene, you see Arnold and Gerald hiding in the sewer under the 5th graders. Arnold then crawls through a very narrow tube, and Gerald follows. You then see the end of the tube and Gerald come out of the it first, and Arnold climbs out last. It would be impossible for Arnold and Gerald to switch places inside the tube because it was way too narrow.

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
Hey Arnold! mistake picture

The Little Pink Book/Field Trip - S1-E2

Continuity mistake: On the "Presidents of the United States" sign behind Helga, the word "United" becomes "Nvited"

AidanN
Hey Arnold! mistake picture

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

Ransom / Ms. Perfect - S2-E6

Continuity mistake: When Lila is finishing her first joke, Rhonda suddenly switches from her French outfit to her "usual" one; also, during the Jell-O incident, her beret disappears and then reappears.

AidanN
Hey Arnold! mistake picture

Operation Ruthless/The Vacant Lot - S1-E7

Continuity mistake: In Operation Ruthless, the pedal in Helga & Phoebe's bumper car changes color from black to gray to black between shots.

Helga's Makeover/The Old Building - S1-E4

Continuity mistake: When the classroom is first shown, the first two desks against the wall near the door are occupied by Curly and Eugene, Gerald and Arnold are sitting where Curly and Eugene were shown.

AidanN

Tutoring Torvald / Gerald Comes Over - S1-E13

Continuity mistake: Arnold and Gerald have to climb stairs to get to Oskar's apartment, but this would mean the building has three floors, and the outside views indicate that there are only two (plus the attic).

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

Arnold Saves Sid / Hookey - S2-E7

Continuity mistake: The kids' teacher in this episode is Miss Slovak, who was their teacher in the first season, but in the first episode of this season they have a new teacher, Mr. Simmons.

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Arnold's Thanksgiving - S3-E14

Continuity mistake: When Joey is shown in close-up, his missing tooth looks like it's there but it's covered with something black and his missing tooth keeps reappearing and disappearing in the last scenes.

AidanN

Arnold Saves Sid / Hookey - S2-E7

Continuity mistake: The clock in the police station looks like it says it's after 5:00, but school is in session.

AidanN

Steely Phil / Quantity Time - S2-E12

Continuity mistake: The digits on Arnold's clock get bigger and change shape while he's talking to Grandpa.

AidanN
Hey Arnold! mistake picture

6th Grade Girls/The Baseball - S1-E5

Continuity mistake: While walking down the stairs, Maria only has three toes on each foot; she has four at the pool.

AidanN
Hey Arnold! mistake picture

Benchwarmer / Cool Jerk - S1-E11

Continuity mistake: The scoreboard has room for 10 names on each side when shown in close-up, but when Arnold is shooting free throws, there are only 7 spaces on each side.

AidanN
Hey Arnold! mistake picture

Downtown as Fruits / Eugene's Bike - S1-E1

Continuity mistake: In the Eugene's Bike episode, when Arnold has to tie his shoe, he sets his books down on a bike in a bike rack. This causes the bike to tip over and makes all the other bikes in the rack to fall down. Eugene's bike falls into the middle of the street and get ran over. When Eugene finds out his bike is destroyed, he looks at Arnold and yells. Right after this you get a good look at the bike rack. You'll notice there are no bikes in or around the bike rack.

Hey Arnold! mistake picture

Tutoring Torvald / Gerald Comes Over - S1-E13

Continuity mistake: Arnold switches from his left hand to his right hand when taking the test.

AidanN

Ghost Bride/Gearold VS Jameo - S5-E25

Continuity mistake: In the scene where they are running from the second ghost bride, they go into a crypt and close the doors. One of the kids puts a shovel through the handles to keep it shut. In the next shot, it's gone. In the shot after that it's back.

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