Continuity: In the Eugene's Bike episode, when Arnold has to tie his shoe, he sets his books down on a bike in a bike rack. This causes the bike to tip over and makes all the other bikes in the rack to fall down. Eugene's bike falls into the middle of the street and get ran over. When Eugene finds out his bike is destroyed, he looks at Arnold and yells. Right after this you get a good look at the bike rack. You'll notice there are no bikes in or around the bike rack.

Continuity: In the teeter-totter scene, Gerald's shirt is number 3 instead of 33.

Continuity: On the "Presidents of the United States" sign behind Helga, the word "United" becomes "Nvited"

Audio problem: When Harold says, "Hey, what are you, scared?" his mouth stays open for the last word. It never closes for the "d" at the end.

Continuity: When the classroom is first shown, Sheena is sitting in the front row, and the first two desks against the wall near the door are occupied by Curly and Eugene, but then Helga is in front of Sheena, and Gerald and Arnold are sitting where Curly and Eugene were shown.

Continuity: While walking down the stairs, Maria only has three toes on each foot; she has four at the pool.

Continuity: In Operation Ruthless, the pedal in Helga & Phoebe's bumper car changes color from black to gray to black between shots.

Audio problem: At the hat store, when Arnold says "Huh? What are you, nuts?", his lips don't move - but Gerald's do.

Factual error: Ernie removes two screws from a glass panel in the skylight, but then lifts the panel from the side that's still screwed in.

Continuity: The scoreboard has room for 10 names on each side when shown in close-up, but when Arnold is shooting free throws, there are only 7 spaces on each side.

Revealing: The names for the Green and Yellow teams' players are the same.

Factual error: There's no way Grandma could have connected two "live" wires with her bare hands without electrocuting herself, and there's certainly no way the wires could have stayed connected.

Continuity: Arnold and Gerald have to climb stairs to get to Oskar's apartment, but this would mean the building has three floors, and the outside views indicate that there are only two (plus the attic).

Continuity: Arnold switches from his left hand to his right hand when taking the test.

Audio problem: When Arnold is playing chess with the Sewer King, Arnold jumps across the table and knocks the King over. This sequence appears to be sped up: the toilet crashes way after it is destroyed, and the King says "Noooooooooooo," yet his mouth never moves.

Audio problem: Helga rides past Arnold in a bus and yells "24 hours until you die!" or something like that. Her mouth never moves- it just stays open in an evil smile.

Continuity: The boarding house has a downstairs bathroom, but in "Gerald Comes Over", there's only one bathroom and it's upstairs.