When Lizzie, Gordo, Miranda and Matt are sitting outside the studio and Matt tells them his Plan B, as Gordo says "Elf costumes? That's plan B?", the black bag strap over his left shoulder jumps from being under his collar to over his collar instantly between shots.
When Lizzie, Miranda and Gordo are in Aaron Carter's dressing room, when they realise that it is actually his dressing room, Lizzie places her tape recorder on the glass table quite near the edge. But in the next shot it is now halfway hanging off the edge.
When Mrs. McGuire pulls up to the studio lot and the security guard leans down to the car window to talk to her, he is holding two red candy twists in his hands. With every shot change the position of his hands and which hands he holds the twists in changes.
When Lizzie, Miranda and Gordo are hiding in the big red sack on the Santa sleigh, after Lizzie pokes her head out she ducks back into the bag and says "Aaron Carter's here!" As the shot changes, the Christmas presents that surround them in the bag rearrange themselves instantly.
As Lizzie, Miranda and Gordo sneak across the studio lot, Gordo stops and says to two ladies "Excuse me, if you guys ever need a professional video director...", but it is a very clear dub, as his mouth is not in sync.
Miranda mentions that Matt managed to pass for a "super-genius" at their school for half a day. But the episode in which that happened ("Lizzie's Nightmares") wasn't broadcast until three months after this one.