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Arnold's Thanksgiving - S3-E14

Continuity mistake: When the play finishes and all the kids are standing on stage, Arnold and Helga are holding hands. Arnold looks at Helga, and Helga pulls her hand away. When the shot changes, they are holding hands again. (00:05:17)

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School Play - S3-E19

Continuity mistake: Lila's collar is gold throughout the episode. When the girls audition for the part of Juliet and Mr. Simmons says that they were all very good, her collar is white, and her gold button is missing. Then when Mr. Simmons says Lila will be the third understudy, her collar is gold again, but her button remains missing. Later on, when Mr. Simmons announces Lila will take the role of Juliet, her collar is white again, and her gold button is missing again. (00:08:46 - 00:14:26)

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School Play - S3-E19

Continuity mistake: When Helga tries to convince Lila to drop out of the play, as she says, "What about that crazy costume you have to wear?", Lila's gold button is missing. It's also missing when Lila says, "I'm sorry, Helga, you're mumbling." (00:15:42 - 00:17:06)

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School Play - S3-E19

Audio problem: Before the play begins, when Mr. Leichliter tells Mr. Simmons, "It's going to be a fiasco," his mouth doesn't move until the shot changes mid-sentence. (00:19:12)

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6th Grade Girls/The Baseball - S1-E5

Other mistake: Sixth Grade Girls: When Arnold and Gerald are dancing with Connie and Maria, in one shot, Maria's left foot is incorrectly overlapping the right foot of the girl behind her. (00:07:32)

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Arnold Visits Arnie / Chocolate Boy - S5-E12

Other mistake: Arnold Visits Arnie: When Arnold wakes up from his dream and he screams, his collar briefly loses its colour. (00:10:38)

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Mugged / Roughin' It - S1-E9

Continuity mistake: Mugged: Throughout the scene with Arnold and Grandma on the bus, Arnold is not wearing his hat. When the creep runs off the bus and the camera shows Arnold and Grandma from outside the bus, Arnold is wearing his hat. (00:11:35)

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Mugged / Roughin' It - S1-E9

Other mistake: Mugged: When the people are standing outside Sunset Arms waiting for Arnold to come out of the garage, Oskar is coloured incorrectly: he has grey hair, a grey beard, an orange shirt, a light blue jacket, and white shoes. (00:05:12)

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Helga Blabs It All / Harold the Butcher - S3-E1

Other mistake: In the credits, actor Elliott Gould's name is misspelled as "Elliot Gould." (00:22:55)

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Hall Monitor / Harold's Bar Mitzvah - S2-E15

Other mistake: In the credits, actor Elliott Gould's name is misspelled as "Elliot Gould." (00:22:59)

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Mugged / Roughin' It - S1-E9

Other mistake: Mugged: When Arnold gets mugged, some of the shots use a flipped background. Note the wall colours, and the sign that says "MARKET," which is reversed. (00:01:16)

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Love and Cheese / Weighing Harold - S4-E7

Plot hole: Love and Cheese: This episode takes place at the Cheese Fair. However, the episode "Operation: Ruthless" also takes place at the Cheese Fair, and it is stated in that episode that the Cheese Fair is an annual event. It can't be that this episode takes place a year later, as the series takes place during the same fourth-grade school year.

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Beaned / Old Iron Man - S5-E11

Continuity mistake: Beaned: When Arnold is walking Helga to school and she sees some flowers, they are both standing on the sidewalk. Two shots later, they are on the road. Also, when Arnold walks up to Helga, he is in mid-air, and when Helga stands up, she is also in mid-air. (00:05:53)

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Hall Monitor / Harold's Bar Mitzvah - S2-E15

Other mistake: In the credits, Justin Shenkarow is credited twice for voicing Harold. (00:22:59)

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Hall Monitor / Harold's Bar Mitzvah - S2-E15

Continuity mistake: Harold's Bar Mitzvah: In the beginning, when Stinky asks Harold if he wants to play stickball, there is no wristband on his arm. Harold says he has to go do his lessons, and in the next shot, a wristband appears on Stinky's arm, then disappears. Later on, when Harold comes out of the synagogue, his wristbands are back on his arms. (00:12:03)

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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

Continuity mistake: Full Moon: Throughout the episode, Harold's eyes change from yellow to white during a few consecutive shots, as well as mid-shot.

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Full Moon / Student Teacher - S4-E1

Continuity mistake: Full Moon: When Arnold leaves the school at the beginning, he is carrying a green book. A few seconds later, the rectangle on the cover changes to white, then back to green. (00:03:14)

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Full Moon / Student Teacher - S4-E1

Continuity mistake: Full Moon: When Principal Wartz tells Arnold to see him every day after school for the next four weeks, the words on his office door are yellow. About a second later, they change to red, then back to yellow. (00:02:57)

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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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