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.
Halloweentown (1998)
1 character mistake - chronological order
Directed by: Duwayne Dunham
Starring: Debbie Reynolds, Joey Zimmerman, Judith Hoag, Kimberly J. Brown, Phillip Van Dyke
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.
Marnie Cromwell: Dylan, it's rude to stare.
Dylan Cromwell: Why don't we talk about how illegal it is to drive without eyeballs?