Continuity mistake: After Marnie has installed the talisman, we are given a glimpse of her where she is flipped. She had been resting on the giant pumpkin with her right leg hiked up and her right foot resting inside the pumpkin's left eye. But she is flipped, with her left leg hiked up and her left foot resting in the pumpkin's right eye.
Continuity mistake: When we first see the movie marquee before Marnie buys her broom in Halloweentown it says "Closed Forever" across the whole sign, but when Luke takes Marnie into the the theater later on, you see that the sign has moved to just one side.
Character mistake: At the beginning of the movie, Marnie states that she is 13 years old. When Grandma Aggie comes to visit, she tells Mom that it is Marnie's 13th Halloween. Since everyone celebrates their first Halloween before they turn one, if Marnie is 13 the events of this movie would occur on her 14th Halloween, meaning her powers would have faded by now.
