Dawn and the Haunted House - S1-E2
Revealing mistake: Stacey can be heard whispering instructions to the kids she and Dawn are watching.
Claudia and the Secret Passage - S1-E8
Continuity mistake: Dawn enters the library wearing open back clogs and exits minutes later in white sneakers and socks.
Other mistake: We know the girls all go to school together, but when they are walking home in the opening scene, they all meet up coming from different directions.
Character mistake: At the end of the dance routine, all of the girls strike a pose with one hand on their hip and the other behind their head, except for Stacey who just stands there.
Character mistake: Jessie's dance moves don't match what the other girls are performing, even though it's a choreographed routine.