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Ransom / Ms. Perfect - S2-E6

Other mistake: Ms. Perfect: When the girls sabotage Lila's lunch, as Helga pours out Lila's milk from her thermos, the milk crosses an invisible line and disappears. (00:16:56)

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Curly Snaps / Pre-Teen Scream - S3-E6

Audio problem: Curly Snaps: At the start, Curly talks to Arnold about how good it is to be ball monitor. When Arnold says, "Well, I never thought of it that way," his mouth stops moving after the word "it." (00:01:25)

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Curly Snaps / Pre-Teen Scream - S3-E6

Continuity mistake: Pre-Teen Scream: When Phoebe shows up at Helga's house to pick her up for the concert, Phoebe is wearing a red outfit with a red scrunchie in her hair. Thereafter, for the rest of the episode, her red scrunchie changes to her normal yellow one in some shots. (00:15:46)

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Curly Snaps / Pre-Teen Scream - S3-E6

Audio problem: Pre-Teen Scream: When Phoebe turns on her CD player and reveals her Ronnie Matthews posters in her room, she says, "Now to compose the winning contest entry," but her mouth isn't moving at all. (00:13:00)

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Curly Snaps / Pre-Teen Scream - S3-E6

Other mistake: Pre-Teen Scream: When the kids are sitting on Arnold's stoop in the beginning, there are two shots where Arnold's pants are the same colour as his skin, giving the sense that he has no pants on. (00:12:03)

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

Continuity mistake: Downtown as Fruits: After Arnold and Gerald arrive at the school, it cuts to Helga crying about her play being ruined. When Phoebe taps her, her left arm is coming from the side of her cheese costume, but when the angle changes, it's coming from the front of her costume. (00:10:43)

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Ransom / Ms. Perfect - S2-E6

Continuity mistake: Ms. Perfect: When Lila goes to Patty's locker, the books she is holding constantly change. First, she is holding two books, then three, then the red book is suddenly on top, then the red book disappears and the rectangle on the brown book changes to white, then it goes back to yellow and the blue book gets replaced by the red one, and finally, the blue book reappears (she is also suddenly not holding the locker handle, and the way she holds the books changes). (00:15:48)

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Ransom / Ms. Perfect - S2-E6

Continuity mistake: Ms. Perfect: When Patty opens her locker and the jello falls on her, her head is raised above the floor, and there is no jello on her head. In the next shot, her head is on the floor, and there is jello on her head. (00:16:24)

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Ransom / Ms. Perfect - S2-E6

Audio problem: Ms Perfect: When Lila says, "Whatever you do, don't smell that cow," the boys are heard laughing, but only Stinky is shown laughing. (00:15:14)

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Ransom / Ms. Perfect - S2-E6

Continuity mistake: Ms Perfect: When Lila is wearing her new blue outfit at recess, she wears light blue bows in her braids, but when she is shown in close-up, she is wearing her regular green bows. There is also a small animation glitch with Lila's right bow. (00:15:22)

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April Fool's Day - S5-E14

Trivia: In this episode, Sid is voiced by Taylor Gifaldi, the younger brother of Sam Gifaldi, Sid's original voice actor. Sid was recast because Sam Gifaldi went through puberty.

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Casa Paradiso / Gerald's Tonsils - S3-E3

Trivia: During the show's production, Gerald's voice actor, Jamil Walker Smith, went through puberty, which drastically deepened his voice. Since the production staff couldn't find a suitable replacement for Gerald, the episode "Gerald's Tonsils" was made to explain Gerald's voice change and allow Jamil to play Gerald for the remainder of the series.

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Dinner for Four / Phoebe Skips - S4-E5

Trivia: These were the last two episodes to be made with traditional cel animation, before switching to digital ink and paint.

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Love and Cheese / Weighing Harold - S4-E7

Continuity mistake: Love and Cheese: At the end, Arnold says to Lila that he will walk her home. In the next shot, a janitor suddenly appears behind them. (00:11:40)

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Love and Cheese / Weighing Harold - S4-E7

Other mistake: Love and Cheese: At the end, when Arnold says to Lila that he will walk her home, they both start walking to the right, then Lila vanishes while on screen. She never leaves the frame. (00:11:42)

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Arnold Visits Arnie / Chocolate Boy - S5-E12

Continuity mistake: Arnold Visits Arnie: When Arnold walks out of the movie theatre, he walks into Hilda and they fall over. In the next shot, they turn 90° counterclockwise. (00:06:45)

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

Continuity mistake: Buses, Bikes, and Subways: Helga wears a watch on her right arm throughout the episode. However, when Helga approaches Sheena's uncle Earl and wakes him up, her watch is missing, then reappears when Earl's boat sinks. It disappears again when Helga comes up from the water, then reappears a moment later. (00:18:59)

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Helga's Masquerade / Mr. Green Runs - S5-E2

Audio problem: Helga's Masquerade: When Helga and Lila are at Slausen's Ice Cream, as Helga tells Lila, "About the way you're always going around acting so nice to people," her mouth stays closed until the word "acting." (00:03:21)

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Helga's Masquerade / Mr. Green Runs - S5-E2

Continuity mistake: Helga's Masquerade: When Helga and Lila are at Slausen's Ice Cream, after Helga asks Lila how she can learn to act so nice to people, she grabs her milkshake with her left hand. A shot later, she is now holding it with her right hand, and a spoon appears in her left hand. (00:03:30)

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Helga's Masquerade / Mr. Green Runs - S5-E2

Continuity mistake: Helga's Masquerade: When Helga and Lila are at Slausen's Ice Cream, after Helga asks Lila where she gets her material from, Lila's right arm is below the table, but a shot later, it's above the table, and a spoon appears in her hand. (00:03:18)

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