Hey Arnold!
All season 3 mistakesMistakes
1Helga Blabs It All / Harold the Butcher17
2Dangerous Lumber / Mr. Hyunh Goes Country0
3Casa Paradiso / Gerald's Tonsils1
4Arnold's Room / Helga vs. Big Patty2
5Stinky Goes Hollywood / Olga Gets Engaged0
6Curly Snaps / Pre-Teen Scream4
7Grandpa's Birthday / Road Trip0
8Sid's Revenge / Roller Coaster1
9The Aptitude Test / Oskar Gets a Job11
10Arnold Betrays Iggy / Helga and the Nanny2
11Career Day / Hey Harold!3
12Best Man / Cool Party1
13Arnold & Lila / Grand Prix9
14Arnold's Thanksgiving6
15Helga's Show / The Flood2
16Phoebe Takes the Fall / The Pig War1
17Crabby Author / Rich Kid1
18Girl Trouble / School Dance2
19School Play9

Longest Monday / Eugene's Pet - S2-E4

Continuity mistake: In "Longest Monday" at one point in the episode, Arnold and Gerald run off of a bus and down an alley. Two fifth graders come chasing after them. In the next scene, you see Arnold and Gerald hiding in the sewer under the 5th graders. Arnold then crawls through a very narrow tube, and Gerald follows. You then see the end of the tube and Gerald come out of the it first, and Arnold climbs out last. It would be impossible for Arnold and Gerald to switch places inside the tube because it was way too narrow.

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The Aptitude Test / Oskar Gets a Job - S3-E9

Suzie: I gave you 100 dollars two days ago.
Oskar: Suzie, you know I had to use it to pay the phone bill.
Suzie: Oskar, they cut off our phone service this morning.
Oskar: I know, it's a terrible mistake. We should sue.
Suzie: Oh, Oskar, that just doesn't make any sense.
Oskar: Tell me about it. So, can I have the 50 dollars?
Suzie: I don't have 50 dollars, we've already spent my paycheck this week.
Oskar: What about your overtime?
Suzie: I work 20 hours a week overtime already, how many more hours do you want me to work?
Oskar: How about 25?
Suzie: OSKAR!

zenee

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More trivia for Hey Arnold!

Answer: No, he did not. He is seen getting off the bus with a suitcase, so he must have not been home for a few days so there is no way he could have known.

Bowling255

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