Revealing: Mr. Simmons counts 30 students in the bus, but nowhere near that many got off (nor have nearly that many fourth graders ever been shown).

Continuity: Iggy removes his sunglasses - twice.

Other: After Phoebe puts hinges on her cast and Helga and Phoebe are in the library. After Phoebe gets away from Helga and hides within the library shelves, she opens her cast and starts scratching her leg. When Arnold sees Phoebe he says to her, " I just saw you open and close your cast." Yet Phoebe never closes her cast.

Continuity: In the scene where Arnold's parents leave for the last time, Grandma's hair is dark at first, then it becomes purplish-gray.

Continuity: In the tricycle section of the last event, the chinpiece of Helga's helmet keeps switching colors.

Revealing: In the scene after the garbage dumpster scene, Buckley's lips disappear briefly while he's talking.

Continuity: When Arnold reads to Helga, the book title says "GEO-" and "GRAPHY" (two words); the next day, it says "GEOGRAPHY" (one word).

Revealing: Phoebe is going into the school in one scene, but as the camera moves she vanishes while on screen.

Plot hole: In the wrestling match, the bell rings after the referee counts to 3 - but he's counting while a wrestler is on the mat stomach-first; a pin requires the loser to be on his back.

Continuity: In the scene where they are running from the second ghost bride, they go into a crypt and close the doors. One of the kids puts a shovel through the handles to keep it shut. In the next shot, it's gone. In the shot after that it's back.