zenee

Helga's Show / The Flood - S3-E15

Continuity mistake: Grandpa's rubber raft got much bigger between the time he left the greenhouse and the time he arrived.

AidanN

Love and Cheese / Weighing Harold - S4-E7

Continuity mistake: Lila was pretty much entirely underwater in a "standing" position when Arnold rescued her, how come suddenly the water only reached her knees?

AidanN

Arnold's Hat/Stoop Kid - S1-E3

Continuity mistake: When Grandpa is telling Arnold about how how he tried to cover his head when his hair falls out, the camera cuts back to him with his arm on Arnold's shoulder and Arnold has his hat on, even though the whole story is about him losing his hat.

Show generally

Continuity mistake: When the four boys form their line (just before the adults call out "Arnold"), watch Harold's tooth; it goes from the right side of his mouth (as you look at him) to his left side.

AidanN

Girl Trouble / School Dance - S3-E18

Continuity mistake: Besides the fact that when Helga is sharpening her pencil, the desk arrangement changes, one of the students visible when she looks at Arnold is... Helga. This happens because the shot is taken from the episode "Helga's Love Potion."

Weird Cousin / Baby Oskar - S4-E11

Factual error: Stephen Viksten is credited twice for voicing Oskar.

AidanN