In "New Teacher", all the students' positions switch around between shots as Principal Wartz announces about the old teacher retiring in the beginning of the episode.
In "Girl Trouble", Helga manages to be both in her seat and standing at the front of the class sharpening her pencil. At the same time, all the desks appear to be arranged in rows, but when she talks to Arnold seconds later, they are in groups.
In "Jamie O. in Love" the license plate on the front of his car reads "KILLER", while the back reads "KILLR".
In "Student Teacher", before Olga is about to board the plane, her luggage disappears for a brief moment.
In "Phoebe Cheats", she wakes up and talks to the statue trophy she illegitimately won, and repeatedly changes from a blue sweater to a night grown and back again between shots.
In "Harold's Kitty", we hear Harold's mother pound on his bedroom door to warn about cat messes, yet in the same shot (and in subsequent shots) the door is wide open.
In "Biosquare", Arnold and Helga enter the greenhouse at 8:00 AM, and must stay in there for 24 hours. When they wake up the next morning, Arnold claims there are six hours to go. This means it is 2:00 AM, yet the sun is up and shining.
In "24 Hours to Live", Helga calls Arnold and says "22 hours and 46 minutes until you die". He then talks to Grandpa and goes up the stairs and talks to Grandma. The phone rings saying Arnold has 22 hours and 14 minutes. This means that it took half an hour to walk up the stairs.
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