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Bug: In the mirrored mini UFO section of "Electroman Adventures," if you time it correctly, you can skip the mirror and ship portal, and complete the rest of the level in the opposite direction.

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Other mistake: The title for "Can't Let Go" is misspelled as "Cant Let Go."

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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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Audio problem: When the bus is heading towards the bulldozer, Arnold and Helga start to scream. They then close their mouths, but their screams can still be heard. (01:06:05)

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Other mistake: When Bob and Nick start fighting, Nick runs into the kitchen and grabs an egg beater. Right before he tries to attack Bob with it, his right shoulder is drawn incorrectly. (00:49:32)

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Party Animal/Ipso Fatso/Don't Yank My Chain - S1-E2

Continuity mistake: Don't Yank My Chain: Throughout the episode, the chain attached to Handy's foot is either on his left foot or his right foot in various shots. Also, in the scene where Handy and The Mole are sinking and they swim back up to grab on to the log, the chain is on Handy's right foot, but when he gets up on to the log, it switches to his left foot mid-shot.

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Party Animal/Ipso Fatso/Don't Yank My Chain - S1-E2

Continuity mistake: Party Animal: When Nutty first appears at the start, there is one lollipop on his left cheek. In the next shot, an extra lollipop appears on it. When Nutty is shown again, it goes back to one lollipop, and it is now on the opposite cheek. (00:00:54)

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Doggone It/Concrete Solution/Sea What I Found - S1-E3

Continuity mistake: Sea What I Found: When the hose flails around and cuts off Lumpy's limbs and antler, his left antler falls off, but when he sinks to the bottom of the ocean, it's his right antler that is missing. (00:19:09)

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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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Dinner for Four / Phoebe Skips - S4-E5

Other mistake: Dinner for Four: When Arnold and Lila are talking to each other in the beginning, Lila says that she hopes to become a famous ballerina one day if she practices hard enough. In this shot, the stripe on her shirt is incorrectly layered over her gold button. (00:01:26)

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Full Moon / Student Teacher - S4-E1

Other mistake: Full Moon: When Arnold tells Sid, Stinky, and Harold that he was given four weeks' detention, Harold tells him to not rat on them. Arnold says he won't tell, and when he walks away, his hair passes right through Sid's head. (00:03:30)

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Continuity mistake: When the emotions grab onto the memory vacuum, Anger's left hand is holding the bottom of the vacuum, but in an instant cut, it's on the switch. (00:50:27)

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Tour de Pond / Teachers Strike - S2-E18

Continuity mistake: Tour de Pond: When Rex's grandfather walks up to Arnold's Grandpa at the end, his badge has eight squares on it, but in the next shot, it changes to four stripes. (00:11:20)

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