Hey Arnold!
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Part-Time Friends / Bio Square - S2-E19

Other mistake: Bio Square: While Phoebe and Stinky are telling the class about their science fair experiment, just as Phoebe shares that it was in honor of her hero, "I.P. Pavlov," watch as Stinky's eyes move off to the side of his head, then the animation layer of his eyes return to normal.

Super Grover

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Helga's Boyfriend / Crush on Teacher - S2-E14

Other mistake: Helga's Boyfriend: Near the start, Helga thinks of somebody to make Arnold jealous, then it cuts to a shot of Stinky in the cafeteria. In this shot, there are two men meant to be standing behind the counter in the background, but their bodies are actually embedded through the middle of it. (00:01:46)

zenee

Hey Arnold! mistake picture

Helga's Boyfriend / Crush on Teacher - S2-E14

Other mistake: Helga's Boyfriend: When Arnold and Stinky are on the swing set, Stinky tells Arnold that he is crazy in love with a girl. Arnold asks him who the girl is, and in the next shot of Stinky, his head disconnects from his body three times. (00:06:40)

zenee

Hey Arnold! mistake picture

Helga's Boyfriend / Crush on Teacher - S2-E14

Other mistake: Helga's Boyfriend: At the Stake Time roller rink, when Helga and Stinky are spinning around like a tornado, many of the kids are standing in mid-air. Brainy and Park are also standing in mid-air in an earlier shot where Helga tells Stinky, "Let's go!" (00:03:58)

zenee

Helga's Boyfriend / Crush on Teacher - S2-E14

Other mistake: Helga's Boyfriend: At the start, Helga starts to profess her love for Arnold in the movie theatre. In this shot, Arnold's hair has four spikes on the right and three spikes on the left. Arnold's hair is supposed to have five spikes on the right and four spikes on the left. Also, just as Helga says, "your every action," Arnold's left side hair changes to four spikes mid-shot. (00:01:06)

zenee

Love and Cheese / Weighing Harold - S4-E7

Other mistake: Love and Cheese: When Arnold and Lila's boat is stuck at the edge of the waterfall, as Lila says, "Arnold, what will we do?" a piece of the boat next to Lila is incorrectly coloured like the background and the seat, so it looks like a hole in the boat. (00:10:14)

zenee

Hey Arnold! mistake picture

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. This happens because the shot is taken from the episode "Helga's Love Potion."

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Helga: Move it, football head!

zenee

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The List/Haunted Train - S1-E8

Question: Why did that boy steal Arnold's ball? Was that the whole reason he came to the park? He seemed awfully obnoxious and destined to ruin Arnold's day, just wanting more clarity. Thank you.

Answer: The episode doesn't really elaborate on who the kid was and what his motives were, so its pure speculation as to why he took it. Perhaps the kid could simply want a ball all for himself and decided to just take it, or was simply a rotten kid. The truth is the kid's motives are not important to the story other than it highlights Arnold was having a lot of trouble getting through the list.

Lummie

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