Character mistake: Helga makes Arnold sit in a plate of chocolate pudding as a prank. Arnold then asks Grandpa on the phone to bring him a new pair of pants. When Grandpa arrives, he asks Arnold, "What's that on your pants?" The pudding is not on Arnold's pants; it's on the back of his shirt. (00:06:25)

Hey Arnold! (1996)
1 character mistake in April Fool's Day
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.
Dinner for Four / Phoebe Skips - S4-E5
Rhonda: She asked you to do WHAT to my Caprini cardigan?
Lila: Snip the tags out?
[Helga grabs Lila].
Helga: Lila, what are you doing? You're not supposed to ask her!
Lila: I just didn't feel right about destroying Rhonda's personal property... without getting her permission first. It seemed, well, ever so wrong.
Helga: Yeah, well, guess what? You're ever so FIRED!
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.
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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 ★