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Revealing mistake: When Philip throws the apple at Wilson from his flying car, Wilson's reaction to getting hit is slightly delayed. (00:39:09)

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What Does Blue Want to Build? - S2-E2

Revealing mistake: When Mailbox first comes in, you can see the letter being moved into place behind Mailbox due to a small part of him being cut off. (00:13:00)

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A Snowy Day - S1-E10

Revealing mistake: During the mailtime segment, when Mailbox shakes snow onto the chair, a small part of him is cut off, and you can see the letter being held behind him. This also happens when Mailbox opens his door, and you can even see a crew member's hand move away as Steve grabs the letter. (00:17:38)

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Full Moon / Student Teacher - S4-E1

Revealing mistake: Full Moon: When Harold tells Arnold, "Remember when I said you didn't have any guts because you wouldn't moon Principal Wartz?" his mouth briefly disappears. This is easier to see in slow motion but is still visible at normal speed. (00:11:16)

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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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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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Revealing mistake: When Helga tells Arnold that she likes him a lot, as Arnold says, "You do? You did this for me?", his mouth disappears for one frame. This is easier to see in slow motion, but it's still visible at normal speed. (00:57:26)

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Gerald's Game / Fishing Trip - S5-E15

Revealing mistake: Gerald's Game: When Arnold and Gerald are playing The King Rules together, as Arnold says, "I'm not going to quit, Gerald," his mouth briefly disappears. (00:09:49)

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Revealing mistake: When Arnold asks Bridget how much the equipment costs, as she says, "It's on the house," her eyebrows disappear for one frame. (00:36:35)

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Revealing mistake: When the head of security carries Arnold and Gerald into Scheck's office, as the camera zooms in on Scheck, one of his buttons disappears twice in two frames, and his other button completely disappears mid-shot. (00:30:18)

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Timberly Loves Arnold / Eugene, Eugene! - S5-E22

Revealing mistake: Timberly Loves Arnold: When Lila tells Arnold that it's sweet that he is hanging out with Gerald's sister, the stripe on her shirt is layered over her gold button for one frame. (00:05:33)

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Timberly Loves Arnold / Eugene, Eugene! - S5-E22

Revealing mistake: Timberly Loves Arnold: When Lila says, "That is, if Arnold doesn't mind making it a threesome," her left eyelashes disappear for one frame. (00:05:50)

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

Revealing mistake: Rhonda Goes Broke: When Rhonda says, "I'm power walking. It's the healthiest way to get home," her mouth disappears four times. (00:21:42)

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Revealing mistake: After the train destroys the DeLorean, its vanity plate is shown spinning around. Just like in the first film, the plate is attached to a steel post stuck into a hole in the train track, which is visible. (01:43:50)

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Phoebe Takes the Fall / The Pig War - S3-E16

Revealing mistake: Phoebe Takes the Fall: When Phoebe is in Helga's room helping her study for the tournament, as Helga says, "Well, let's call it a night," her left side hair is missing, then it appears mid-shot. (00:06:54)

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Big Pink Loser / Bubble Buddy - S2-E3

Revealing mistake: Big Pink Loser: When Patrick says, "Why can't I do anything right?", and starts hitting his broom on the floor, the drinks that are supposed to be on the customers' tables are instead layered behind them. (00:05:18)

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The Big Scoop / Harold's Kitty - S2-E3

Revealing mistake: Harold's Kitty: When Arnold kicks the ball during the kickball game, he starts running, and he is layered over Helga, even though he is supposed to be behind her. (00:12:20)

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Big Pink Loser / Bubble Buddy - S2-E3

Revealing mistake: Big Pink Loser: When Patrick is answering phone calls, the third time he picks up and says, "No, this is Patrick", the anchor symbol on his hat briefly vanishes. (00:04:36)

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

Revealing mistake: Helga's Boyfriend: When Arnold walks up to Helga to tell her that Stinky loves her, he asks if he can talk to her about something, and in the shot of Helga, there is a line at the bottom of the screen going through her legs, cutting them off. (00:08:04)

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Operation Ruthless/The Vacant Lot - S1-E7

Revealing mistake: Operation Ruthless: When Helga and Phoebe are chasing Ruth in the bumper car, when Ruth's car stops and Helga looks back at her, Helga's right lower leg is incorrectly layered over the bumper car seat, and Phoebe's legs are colored black. (00:08:11)

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