Character mistake: In the credits, when Kate E. Soucie is credited as Lunch Lady, Lunch Lady is misspelled as "LunchLady" without a space. (00:22:58)
Character mistake: In the credits, when Kate E. Soucie is credited as Lunch Lady, Lunch Lady is misspelled as "LunchLady" without a space. (00:22:58)

Weird Cousin / Baby Oskar - S4-E11
Other mistake: Stephen Viksten is credited twice for voicing Oskar.
The Aptitude Test / Oskar Gets a Job - S3-E9
Interviewer: You're kidding, right?
Arnold: No, it's not a joke, he really wants to work.
Interviewer: He's 38 years old, he's never had a job, and you expect me to hire him... as an X-ray technician? [Laughs].
Helga's Makeover/The Old Building - S1-E4
Trivia: Helga walks by the "Law Office of Garcia, James A."; Tricia Garcia is the storyboard artist for this episode.
Arnold's Hat/Stoop Kid - S1-E3
Question: Did Harold already know that the Stoop Kid had just left his stoop the first time? He would have known that a while ago due to a large crowd in the city or even in the newspaper.
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 ★